What art books are: Women have smaller necks and narrower shoulders than men. They're about half a head shorter but [blah blah blah...]
What art books should be: Don't fall into the rut of only drawing characters with white-coded facial features. Here's a picture of a goo girl happily taking her progesterone pills. Binders don't entirely make someone's breast tissue vanish, and affect the draping of shirts in X and Y way[...]