MOOOOOOAAARRRR BEEEEEEFFF!! In grand musclebaby tradition you need to hulk this guy out, really get his muscles up to a point of immobility. Like thus:
In all seriousness, I tried to improve your palette, and give him more definition. Don't take him to the point I did, but this is no clay soldier! Get rid of the straight lines running along his body and define his muscles at least a little bit, if that's what you're going for.
