well. lets see
here is some things thay you can change.:
I can see how you are trying to make your arms muscular but
liek theyre unporportional. i could explain more if i knew how to red line it or whatever.
and the hair needs to have some what on an outline. also the way the legs are shaped to like on his pants zipper part thing ( i dunno what it is called) isnt in line with the body.