A good starting point, but much work needs to be done yet
the basic form is good, although Im not sure if its that he has no neck, or his shoulders are just too bulky, but it looks out of place.
the hands need alot of work, mainly to give more form and features to them, at the moment they are very south-park like LOL
the shading on the shirt needs either re-doing or more work. I take it the basic idea was for folds in the shirt creating the shadow, but with only 2 colors, the folds dont show up, just there shadows, making it look strange