I agree that the helmet looks a bit too large. Makes the allied soldier look cartoonish, and less interesting, and doesn’t really suit the art direction of ETQW, imho.
About the character model, I think the texture’s colors could use more variation.
The silhouette is weak. It’s not a terribly important thing, actually, but all of the classes need to have different silhouettes. For the soldier, that will be taken care of for him by his weapons, but for other classes, they need to be carrying things that that particular job would require. Like I think the axis soldier carries a spade, while it is also carried by the allied engineer. The spade does not have to be rigidly bound to the body, but may be bound to the hips, perhaps, so that they are made apparent in interesting ways during animation. That might be wrong, logically, but you should come up with things like that, appropriately.
You’ve gotten the bagginess around the shins and arms to look pretty decent, but the areas where you have lots of tension in reality don’t show, here. If you’re using Zbrush, use the pinch brush, or something, to create little creases in the crotch, elbow, and beneath the glutes. Also, there needs to be some folds in the armpit area, definitely.
The front of the shirt also lacks that completely, when it should have at least a little bit, of undulation that interacts with the pockets–
Where are the shirt pockets? And the pants pockets? And the crease for the folded sleves?
Also, you’re having a problem with the face. There’s a shading error around the bottom lip. And the furrowed brow, if in fact, it was intended to be furrowed, looks strange and unnatural. The creases seem to go far into the forehead region, making it look like scar tissue.
The vert weights where the forearm meets the bicep, don’t seem weighted properly, in that you not only get shading errors when the arm bends, but you can see the distortion of the topside of the forearm that bends into the bicep, and the bottom of the bicep’s top side, as well.
Where the bicep meets the shoulder is a bit too round, but I feel like that’s probably just my opinion, and not something that really needs to be fixed.
This seems like a lot of ****, but seeing the work you’ve done so far, I think it should be relatively easy for you to fix, if you were so inclined.
Nice shin thingies, btw. Real nice.