I really like the work that you have done. When you started modeling characters did you first study biology/anatomy learning all the body muscles? I am a total newbie to 3d modeling and I am just sticking to hardsurface modeling at the moment, but I can imagine it takes more skill to model a body and get it right.
Went to college for game design, Most of the artistic skills where just self taught though...lots of practice and failures lol. Your a great artist already, so once you learn the technical things, you will be great!
might be fun if you take him that far.. anatomy needs work.. I see issues in the ankles and legs.. upper body looks pretty good.. however, the back muscles and butt look a little wonky.. still looks cool as far as style goes tho.. keep it up!