Study of Angel's Hand for "Mercy's Dream" (1857) by Daniel Huntington. Original from The Smithsonian. Digitally enhanced by… Free Image from public domain license 
Studieblad met tekenvoorbeelden: koppen, lichaamsdelen en dieren
Tekenvoorbeelden (series title) (1610 - 1630) by Michael… Free Image from public domain license 
Two Paintings of Deer Antlers (ca. 1762–1767) by The Qianlong Emperor. Original from The MET Museum. Digitally enhanced… Free Image from public domain license 
Wolkenstudies (cloud study) by Joseph August Knip (1777–1847). Original from The Rijksmuseum. Digitally enhanced by… Free Image from public domain license 
Studieblad met tekenvoorbeelden: ogen, koppen en dieren
Tekenvoorbeelden (series title) (1608 - 1660) by Michael Snijders.… Free Image from public domain license 
A Part of an Aqueduct in Rome (ca. 1809–1812) by Joseph August Knip. Original from The Rijksmuseum. Digitally enhanced… Free Image from public domain license 
Studieblad met planten en watervogels (study sheet with plants and waterfowl) by Joseph August Knip (1777–1847).… Free Image from public domain license 
Grandmother properly cleaning fresh, uncooked produce under a running tap. Original image sourced from US Government… Free Image from public domain license 
The 18th century illustration of a black and white mottled bird on tulip stem with daffodils and butterflies. Original from… Free Image from public domain license 
Wilde planten en bloemen (1878–1917) print in high resolution by Theo van Hoytema. Original from The Rijksmuseum.… Free Image from public domain license 
Grandmother properly cleaning fresh, uncooked produce under a running tap. Original image sourced from US Government… Free Image from public domain license 
Shells in seaweed by Mary Altha Nims (1817–1907). Original from The Cleveland Museum of Art. Digitally enhanced by… Free Image from public domain license 
Vintage fishhook cactus. Original from Biodiversity Heritage Library. Digitally enhanced by rawpixel. Free Image from public domain license 
The 18th century illustration of a European green woodpecker on a branch with rose and forget me nots. Original from The… Free Image from public domain license 
Bomen in de omgeving van Subiaco (trees in the Subiaco area) by Joseph August Knip (1777–1847). Original from The… Free Image from public domain license 
Hand drawn red maple leaves. Original from Biodiversity Heritage Library. Digitally enhanced by rawpixel. Free Image from public domain license 
Fruit Arrangement: Peaches and Plums on a Slab of Marble (1742) by Georg Dionysius Ehret. Original from The Cleveland Museum… Free Image from public domain license 
The 18th century illustration of a bird perched on a branch which bears a pear, red and white blossoms, and leaves with a… Free Image from public domain license 
The 18th century illustration of a brown bird with red head on carnation stem with butterflies. Original from The… Free Image from public domain license 
The 18th century illustration of a basket of blooming flowers. Original from The Smithsonian. Digitally enhanced by rawpixel. Free Image from public domain license 
Studie van bladeren (study of leaves) by Joseph August Knip (1777–1847). Original from The Rijksmuseum. Digitally… Free Image from public domain license 
Chinese insect drawing of five butterflies, a beetle, caterpillar and a grasshopper from the 18th century. Original from The… Free Image from public domain license 
The 18th century illustration of a basket of blossoms and leaves with pomegranates on earth. Original from The Smithsonian.… Free Image from public domain license 
A woman receiving an influenza vaccination at the Maternal and Child Hospital in Vientiane, Laos. Original image sourced from… Free Image from public domain license 
Children holding vaccination tube waiting to get vaccinated. Original image sourced from US Government department: Public… Free Image from public domain license 
Studies of eyes (1630–1640) by Jusepe de Ribera. Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Daggers and sheaths from the Industrial arts of the Nineteenth Century (1851-1853) by Sir Matthew Digby wyatt (1820-1877). Free Image from public domain license 
Skull of a cow (1816) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Dancing girls at Cairo illustration by David Roberts (1796–1864). Original from The New York Public Library. Digitally… Free Image from public domain license 
Asiatic elephant (Elephas maximus) indicus illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from… Free Image from public domain license 
Approach of the simoom Desert of Gizeh illustration by David Roberts (1796–1864). Original from The New York Public… Free Image from public domain license 
Dead bird (1919) by Julie de Graag (1877-1924). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Paper hangings from the Industrial arts of the Nineteenth Century (1851-1853) by Sir Matthew Digby wyatt (1820-1877). Free Image from public domain license 
Russell's Sting Ray (Trygon Russellii) from Illustrations of Indian Zoology (1830-1834) by John Edward Gray (1800-1875).… Free Image from public domain license 
Illustration of the collier from The Costume of Yorkshire (1814) by George Walker (1781-1856). This image features also… Free Image from public domain license 
Cock illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own 1892 edition of Dictionnaire… Free Image from public domain license 
Hand drawn field mushroom. Original from Biodiversity Heritage Library. Digitally enhanced by rawpixel. Free Image from public domain license 
Pauw (in or before 1877–1903) print in high resolution by Theo van Hoytema. Original from The Rijksmuseum. Digitally… Free Image from public domain license 
Vintage russula emetica mushroom. Original from Biodiversity Heritage Library. Digitally enhanced by rawpixel. Free Image from public domain license 
Study of Mushrooms (1880) by Mary Vaux Walcott. Original from The Smithsonian. Digitally enhanced by rawpixel. Free Image from public domain license 
The 18th century illustration of pair of brown birds on bouquet with tulip, rose, and snapdragons, with butterflies. Original… Free Image from public domain license 
The 18th century illustration of a bird on an orange branch with butterfly. Original from The Smithsonian. Digitally enhanced… Free Image from public domain license 
The 18th century illustration of two birds on a branch of tulips with insects. Original from The Smithsonian. Digitally… Free Image from public domain license 
Chinese insect drawing of four butterflies, a moth, praying mantis and two insects from the 18th century. Original from The… Free Image from public domain license 
Ontwerp voor aankondiging en bestelkaart met pauwen (1878–1894) print in high resolution by Theo van Hoytema. Original… Free Image from public domain license 
Hand drawn blood lily bulb. Original from Biodiversity Heritage Library. Digitally enhanced by rawpixel. Free Image from public domain license 
Louisiana Heron from Birds of America (1827) by John James Audubon, etched by William Home Lizars. Original from University… Free Image from public domain license 
The 18th century illustration of a small black and white bird on rose leaf with blossoms and butterflies. Original from The… Free Image from public domain license 
The 18th century illustration of pair of brown birds with blossoms, berries, and a butterfly. Original from The Smithsonian.… Free Image from public domain license 
The 18th century illustration of a yellow and blue bird on bouquet with rose, tulips, and daffodils, with butterflies.… Free Image from public domain license 
Chinese insect drawing of five butterflies, two beetles and an insect from the 18th century. Original from The Smithsonian… Free Image from public domain license 
The 18th century illustration of brown and black bird and blue and yellow birds on branch with red blossoms hunting insects.… Free Image from public domain license 
The 18th century illustration of a basket filled with lemons and their leaves and blossoms; one lemon partially peeled, a… Free Image from public domain license 
Ramses-Meïamoun fight against Katas on the edge of Orontes from Histoire de l'art égyptien (1878) by Émile… Free Image from public domain license 
Moss Campion (Silene acaulis) (1924) by Mary Vaux Walcott. Original from The Smithsonian. Digitally enhanced by rawpixel. Free Image from public domain license 
3. Blue crab (Lupa decanta) illustration from Zoology of New York (1842–1844) by James Ellsworth De Kay. Original from… Free Image from public domain license 
Chinese insect drawing of five butterflies, two beetles and a dragonfly from the 18th century. Original from The Smithsonian… Free Image from public domain license 
Colourful and surreal illustrations of fishes found in Moluccas (Indonesia) and the East Indies by Louis Renard (1678 -1746)… Free Image from public domain license 
Common American Swan from Birds of America (1827) by John James Audubon (1785 - 1851), etched by Robert Havell (1793 - 1878).… Free Image from public domain license 
Kwitantie voor proefexemplaar van 'Het leelijke jonge eendje' (1893) print in high resolution by Theo van Hoytema. Original… Free Image from public domain license 
Different types of fishes illustrated by Charles Dessalines D' Orbigny (1806-1876) Digitally enhanced from our own 1892… Free Image from public domain license 
Scarlet Ibis from Birds of America (1827) by John James Audubon (1785 - 1851 ), etched by Robert Havell (1793 - 1878).… Free Image from public domain license 
The 18th century illustration of a basket of blooming flowers. Original from The Smithsonian. Digitally enhanced by rawpixel. Free Image from public domain license 
Hanen en kuikens (1898) print in high resolution by Theo van Hoytema. Original from The Rijksmuseum. Digitally enhanced by… Free Image from public domain license 
Nurse wearing green latex gloves to protect herself. Original image sourced from US Government department: Public Health… Free Image from public domain license 
Casoar à casque illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own 1892 edition… Free Image from public domain license 
Persimmons by Kōno Bairei (1844-1895). Digitally enhanced from our own original 1913 edition of Bairei Gakan. Free Image from public domain license 
Colourful and surreal illustrations of fishes found in Moluccas (Indonesia) and the East Indies by Louis Renard (1678 -1746)… Free Image from public domain license 
Arlésiennes (Mistral) (1888) by Paul Gauguin. Original from The Art Institute of Chicago. Digitally enhanced by… Free Image from public domain license 
Gangetic Platanista (Platanista Gangetica) from Illustrations of Indian zoology (1830-1834) by John Edward Gray (1800-1875).… Free Image from public domain license 
Feather by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Sketch of a cat (1813) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Chinese butterfly and insect painting from the Qing Dynasty (1644–1911) by anonymous. Original from The MET Museum.… Free Image from public domain license 
Idus-Carp (Cyprinus Idus) from Ichtylogie, ou Histoire naturelle: génerale et particuliére des poissons… Free Image from public domain license 
Mount Fuji as Seen from Kashiwabara, hand–colored albumen silver print from Japan. Described and Illustrated by the… Free Image from public domain license 
Jaguar (Panthera Onca) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own 1892 edition… Free Image from public domain license 
Collection of Various Butterflies from A history of the earth and animated nature (1820) by Oliver Goldsmith (1730-1774).… Free Image from public domain license 
Green birdwing (Ornithoptera priamus) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our… Free Image from public domain license 
O Grave, where is thy Victory? (1892) by Jan Toorop. Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Het Colosseum te Rome (The Colosseum in Rome) by Joseph August Knip (1777–1847). Original from The Rijksmuseum.… Free Image from public domain license 
Royal bengal tiger from Johnson's household book of nature (1880) by John Karst (1836-1922). Free Image from public domain license 
Woman Lying in the Dunes near Noordwijk (1902) by Jan Toorop. Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
The 18th century illustration of a bouquet of two carnations and a tulip bound by a blue ribbon; bird perched on tulip;… Free Image from public domain license 
The 18th century illustration of pair of birds on a branch with roses and butterflies. Original from The Smithsonian.… Free Image from public domain license 
Hand drawn coral aloe. Original from Biodiversity Heritage Library. Digitally enhanced by rawpixel. Free Image from public domain license 
The 18th century illustration of a grey and coral bird on bouquet with rose, tulip, daisies, and forget me nots, with… Free Image from public domain license 
The 18th century illustration of a blue bird on a bouquet of roses and tulips with butterflies. Original from The… Free Image from public domain license 
Hand drawn horse mushroom. Original from Biodiversity Heritage Library. Digitally enhanced by rawpixel. Free Image from public domain license 
Young woman with wavy hair in front of a sea with ships (1900) by Jan Toorop. Original from The Rijksmuseum. Digitally… Free Image from public domain license 
The 18th century illustration of a small red headed bird on rose branch. Original from The Smithsonian. Digitally enhanced by… Free Image from public domain license 
The 18th century illustration of two brown birds on a branch with tulip, berries, and insects. Original from The… Free Image from public domain license 
Pink rose by Kōno Bairei (1844-1895). Digitally enhanced from our own original 1913 edition of Barei Gakan. Free Image from public domain license 
Attacus Atlas Moth (Attacus Aurora) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own… Free Image from public domain license 
Common Peacock, Ringed Pheasant, Horned Pheasant, and Silver Pheasant from A history of the earth and animated nature (1820)… Free Image from public domain license 
The 18th century illustration of two brown birds with carnations and butterflies. Original from The Smithsonian. Digitally… Free Image from public domain license 
The 18th century illustration of two brown and yellow birds on branches with carnations and insects. Original from The… Free Image from public domain license 
The 18th century illustration of a blue bird on a branch with carnations and insects. Original from The Smithsonian.… Free Image from public domain license 
Roseate Spoonbill from Birds of America (1827) by John James Audubon, etched by William Home Lizars. Original from University… Free Image from public domain license 
Five Capitals in the Villa Mattei in Rome, The Baths of Caracalla and Two Capitals from the Villa Mattei in Rome (ca.… Free Image from public domain license 
The 18th century illustration of a brown bird on a branch with persimmons and a butterfly. Original from The Smithsonian.… Free Image from public domain license