Why? I think it is a lovely expression of him..i have had to study the bones of things and draw the muscle of a man in every life drawing class..a zillion times..one of the few memories of my father was when i was young and took him a drawing of a horse..he took out his red pencil and said..a horse's leg cannot bend this way.. i think i was five..but he did a good thing..i went back and looked at the horse's leg..and looked at everything differently after that. There is something lost tho..when you have to take it down to hard bones..i love spontinanity! Zuess looks very happy and that is a great thing for your drawing to convey!