I agree, the image is a little small to reall see the details, however it has good form. Agree with Joe to look at some of the classic anatomical references. Davinci did many.
May your world be painted in the Brightest of colors!
-Artist/Illustrator / Film/Media Designer & SFX MakeUp / Storyboard Artist
(All mediums; Conceptual Design, Costume Creation, to Application)