A profile of an old mentally disabled man, skulls of various races, skulls of a monkey and an orangutan, and a perfect… https://www.rawpixel.com/image/13953467/image-cartoon-face-personFree Image from public domain licenseMister Magot. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3295382/free-photo-image-nature-animal-animals-images-picturesFree Image from public domain licenseApes' skulls: six figures showing ape heads and an ape skull from the front and in profile. Line engraving, 1780/1800. https://www.rawpixel.com/image/13954399/image-cartoon-face-personFree Image from public domain licenseÉcorché head of a man, subcutaneous level, seen in profile. Etching by A. von Perger, ca. 1850. https://www.rawpixel.com/image/14000064/image-cartoon-face-personFree Image from public domain license