Lovely! Great colour work. Just curious, how many polys/tris?
I agree with Indigo about the visor resolution. It was the first place I looked (I imagine a common behaviour for humans to immediately look towards the face of a figure). You could sacrifice all manner of other, less important areas of the figure to get more resolution for that key section. The pants, the dark uniform blotches, the inside of the hands, all candidates for downsizing.
The belt seems very blotchy and vague. It looks like ultra-low-res texture with extreme tri-linear filtering on it (I know it's not, I'm just saying that's how it looks).
The guy's mouth seems reaaaally big. To the point of distortion. Possibly a result of how you unwrapped the face?
The walking animation seems like he is almost crouched or half-squatted, and plodding along. Feels like there should be some point where the legs straighten.