Skull of a cow (1816) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Painted wooden spoons from Histoire de l'art égyptien (1878) by Émile Prisse d'Avennes. Original from The New… Free Image from public domain license 
Deer hunting and Crocodile hunting illustration from Grand voyages (1596) by Theodor de Bry (1528-1598). Original from The… Free Image from public domain license