President Barack Obama laughs during a meeting in the Oval Office, Jan. 24, 2011. https://www.rawpixel.com/image/4051192/image-face-public-domain-personFree Image from public domain licenseForest near Wolf Creek Pass, 05/1972. Photographer: Norton, Boyd. Original public domain image from Flickr https://www.rawpixel.com/image/8802887/photo-image-plant-tree-wolfFree Image from public domain licenseAnne Biget [soeur Marthe]. Line engraving by P. F. Bertonnier after himself. https://www.rawpixel.com/image/13973745/anne-biget-soeur-marthe-line-engraving-bertonnier-after-himselfFree Image from public domain licenseHenry William Fuller. Photograph by Barraud & Jerrard, 1873. https://www.rawpixel.com/image/14008733/henry-william-fuller-photograph-barraud-jerrard-1873Free Image from public domain licenseMoritz Gerhard Thilenius. Stipple engraving by C. Felsing. https://www.rawpixel.com/image/14005640/moritz-gerhard-thilenius-stipple-engraving-felsingFree Image from public domain licenseDeserving Objects of Gratuitous Relief by Willoughby Wallace Hooper https://www.rawpixel.com/image/14319189/deserving-objects-gratuitous-relief-willoughby-wallace-hooperFree Image from public domain licenseWilliam Harvey. Stipple engraving by J. Thomson, 1839, after C. Janssen. https://www.rawpixel.com/image/14011500/william-harvey-stipple-engraving-thomson-1839-after-janssenFree Image from public domain licenseHenry Ingersoll Bowditch. Photogravure by H. G. Smith, 1883. https://www.rawpixel.com/image/13979731/henry-ingersoll-bowditch-photogravure-smith-1883Free Image from public domain licenseThe Blessed Virgin of Pietraquaria at Averzano. Lithograph after L. Giannantoni, 1859. https://www.rawpixel.com/image/14022052/image-cartoon-face-personFree Image from public domain licenseSmall puppy playing with yellow toy pig on a green lawn. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3293468/free-photo-image-dog-animal-ballFree Image from public domain licensePierre Paul Émile Roux. Photogravure after A. G. A. Edelfelt, 1895. https://www.rawpixel.com/image/13997667/pierre-paul-emile-roux-photogravure-after-edelfelt-1895Free Image from public domain licensePrincess George/Princess Clementine & children. Saxony. by Hanns Hanfstaengl https://www.rawpixel.com/image/14307321/princess-georgeprincess-clementine-children-saxony-hanns-hanfstaenglFree Image from public domain licenseUnidentified man with long muttonchops, standing by Kitchen https://www.rawpixel.com/image/14308786/unidentified-man-with-long-muttonchops-standing-kitchenFree Image from public domain licenseThe Virgin of Fevers in S. Maria Maddalena at Bologna. Colour lithograph. https://www.rawpixel.com/image/13966977/the-virgin-fevers-maria-maddalena-bologna-colour-lithographFree Image from public domain licenseSir Christopher Wren. Line engraving by E. Scriven, 1809, after M. Rysbrack. https://www.rawpixel.com/image/14006589/sir-christopher-wren-line-engraving-scriven-1809-after-rysbrackFree Image from public domain licenseValeriano Luigi Brera. Stipple engraving by Fratelli Bordiga after Mora. https://www.rawpixel.com/image/14008292/valeriano-luigi-brera-stipple-engraving-fratelli-bordiga-after-moraFree Image from public domain licensePainting of Madonna nursing Christ child by Jakob Höflinger https://www.rawpixel.com/image/14315369/painting-madonna-nursing-christ-child-jakob-hoflingerFree Image from public domain licenseHannah Snell, a woman who passed as a soldier. Mezzotint by J. Young, 1789, after R. Phelps. https://www.rawpixel.com/image/14016049/image-face-person-artFree Image from public domain licenseJames Ware. Stipple engraving by W. Ridley, 1804, after M. Brown. https://www.rawpixel.com/image/13997760/james-ware-stipple-engraving-ridley-1804-after-brownFree Image from public domain licenseFree young cow standing on grass image, public domain animal CC0 photo. https://www.rawpixel.com/image/5903789/photo-image-background-public-domain-greenFree Image from public domain licenseBlood-vessels of the head and neck. Coloured lithograph by J. Maclise, 1851. https://www.rawpixel.com/image/13965017/blood-vessels-the-head-and-neck-coloured-lithograph-maclise-1851Free Image from public domain licenseA man from the Hawaiian Islands wearing a mask; encountered by Captain Cook on his third voyage (1777-1780). Engraving by T.… https://www.rawpixel.com/image/13998071/image-cartoon-face-personFree Image from public domain licenseRaphael, Sainte Famille, au Musee de Valladolid by Juan Laurent https://www.rawpixel.com/image/14277285/raphael-sainte-famille-musee-valladolid-juan-laurentFree Image from public domain license"Terrour" from le Brun, Heads. Representing the various passions of the soul..., circa 1760 https://www.rawpixel.com/image/13984997/image-paper-cartoon-faceFree Image from public domain licenseClaude Louis Berthollet. Lithograph by Delpech after N.E. Maurin. https://www.rawpixel.com/image/14007080/claude-louis-berthollet-lithograph-delpech-after-ne-maurinFree Image from public domain licenseJoseph Hume. Stipple engraving by J. Brown after J. Stewart. https://www.rawpixel.com/image/14008579/joseph-hume-stipple-engraving-brown-after-stewartFree Image from public domain licenseUnidentified well-dressed man with moustache, seated by J Craik https://www.rawpixel.com/image/14308178/unidentified-well-dressed-man-with-moustache-seated-craikFree Image from public domain licenseMurillo. L'enfant Jesus et St. Jean. Les enfants a la coquille (au Musee du Prado) by Juan Laurent https://www.rawpixel.com/image/14278444/image-face-jesus-personFree Image from public domain licenseSacramento Water Tower, Meadowview, Sacramento, California, August 14, 2018. https://www.rawpixel.com/image/6111956/photo-image-public-domain-logo-freeFree Image from public domain licenseGroepsportret van vijf mannen (1862 - 1866) by Antoon Bauduin https://www.rawpixel.com/image/13757413/groepsportret-van-vijf-mannen-1862-1866-antoon-bauduinFree Image from public domain licenseTwo unidentified men seated: one with a moustache, the other with a Vandyke beard and wearing a hat by Tewis Michelson https://www.rawpixel.com/image/14306416/image-face-person-artFree Image from public domain licenseCanon's Dutch headquarters in Amstelveen, the Netherlands, April 30, 2017. https://www.rawpixel.com/image/6111440/photo-image-public-domain-logo-freeFree Image from public domain licenseFranciscus Josephus Pahud de Valangin. Coloured stipple engraving by J. Collyer, 1794, after L. F. Abbott. https://www.rawpixel.com/image/13997710/image-face-person-artFree Image from public domain licenseJames Ware. Stipple engraving by H. Cook, 1839, after M. Brown. https://www.rawpixel.com/image/13980645/james-ware-stipple-engraving-cook-1839-after-brownFree Image from public domain licenseBalancing stones isolated on white background. Free public domain CC0 photo https://www.rawpixel.com/image/6017028/photo-image-wallpaper-white-background-public-domainFree Image from public domain licenseGenrebilder nach der Natur. Landliche Unschuld. [Unidentified little girl with scarf on head, standing in a chair] https://www.rawpixel.com/image/14307064/photo-image-face-person-woodFree Image from public domain license