Burne Hogart (one of the founders of the School of Visual Arts in New York) produced a series of educational books essential to artists who want to improve their skills.
My favorite of his books is DYNAMIC LIGHT AND SHADE which presents hundreds of illustrations of form and figure draped in light and shadow. Hogarth's books are not step by step how to's instead offering illustrations for you to study and copy.
A masterful book from a true master.
