Clockwise from top: Anne Frank, Kaler Abdolah, Vincent Van Gogh
Dutch creative director Raphael Dahan has nearly 20 years of experience as a digital artist and photo retoucher, and he demonstratess his expert hand in a series of images of books that are intended to look like busts... which is to say that you the images are remarkably photorealistic renderings, easily mistaken for photos of actual books that have been carved to resemble faces.
As for the skull... well, the skull is just badass.
The sliced rendering vaguely looks like a composite medical scan.
See more (and much larger) images in his Corefolio—it's well worth seeing the rest of his work.