The Milkmaid (ca. 1660) by Johannes Vermeer. Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Nasturtiums (1905) by Odilon Redon. Original from the Yale University Art Gallery. Digitally enhanced by rawpixel. Free Image from public domain license 
A Perch of Birds vintage illustration wall art print and poster design remix from original artwork. 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