Great Ref!
A great balance between anatomy and simplification. Best deal on human anatomy reference, consider most physical models like those 15 to 20 in figures you might see in a life drawing class can easily reach +500$. Books from George Bridgman, David Rubin, or contemporaries like Steve Hampton are main stays but, a representation that you can articulate different angles is incredibly helpful.
Kevin Robertson Jr. about
L'Ecorché