You have a lot of strange issues in your mesh proportion and anatomy wise, mainly anatomy, first of all I would think that that frontal chest plate like thing is supposed to actually be similar to the muscle structure of the body? In that case the pectoral muscles are very misshapen and squareish, if you look on some real images of people or anatomy references you'll notice that the pectorals are pretty small, only that a lot of more cartoony things and such likes to enhance them. Obviously you don't need to have the frontal plate in completely anatomically correct shape but really, it'd look a lot better if it was.
One area that I can see instantly needs some improvement is the arms, arms are quite tricky mainly just because they include the shoulders, and the shoulders include the deltoids, which I think are very important to include on a model such as this. First of all the entire lower part of the arm and a bit of the upper part has a slight twist to it, as you'll notice if you look at some reference, and the deltoid is missing as I noted before, which would make him waving his hand quite the chore.
Here's a model that I made for the competition, just the base mesh but I'm quite happy with the way it turned out, notice mostly the way the pectoral blends into the deltoid and the arm and how the arm sort of twists. Oh and the deltoid obviously.
Looks good though, it's nice to see your improvement on this board.
Alucard94, the member of the future of the past.