its preety cool but there are few things that bother me:
the head looks really off,and is positioned way too mutch to the left..
also i think that if you would have making the chest and arms more cartoon style like the rest of the drawing it would have been mutch better.
try to make the "mouth" smaller so it is not spread all over his chest to the begining of the back,it looks wierd that way..
and one last thing is to make a background so the drawing will have more vibes in it and will be less boring.
other then that you got nice anatomy and style,i like it.