Apple (Malus Domestica) (1919) by Royal Charles Steadman. Original from U.S. Department of Agriculture Pomological Watercolor… Free Image from public domain license 
Green plants from Momoyogusa–Flowers of a Hundred Generations (1909) by Kamisaka Sekka. Original from the The New York… Free Image from public domain license 
Vintage European style cart engraving. Original from the British Library. Digitally enhanced by rawpixel. Free Image from public domain license 
Delicious peach in a branch illustration. Digitally enhanced illustration from U.S. Department of Agriculture Pomological… Free Image from public domain license 
Omega and the Pig (ca. 1908–1909) by Edvard Munch. Original from The Art Institute of Chicago. Digitally enhanced by… Free Image from public domain license 
Saddled horse (1823) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Plums (Prunus Domestica) (1918) by Royal Charles Steadman. Original from U.S. Department of Agriculture Pomological… Free Image from public domain license 
Standing horse at a fence by Jean Bernard (1775-1883). Original from the Rijks Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Lying cow (1821) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Lying cow (1821) by Jean Bernard (1775-1883). Original from the Rijks Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Sheep, In The Malakani Colony from Russia Described And Illustrated By Dixon, Biancardi, Moynet, Vereschaguine And Henriet… Free Image from public domain license 
Holland from The World: Round It and Over It (1881) published by Chester Glass. Original from the British Library. Digitally… Free Image from public domain license 
Sheep, In The Malakani Colony from Russia Described And Illustrated By Dixon, Biancardi, Moynet, Vereschaguine And Henriet… Free Image from public domain license