I do see what EvilEye means, and I agree. The perspective immediately looked a bit fishy to me but I couldn't articulate it. The shoulder is definitely a few pixels too high for that perspective.
To expand on his comment about smaller subtleties, I think the perspective of the arm furthest away also seems to suggest the viewer is at eye-level and the figure is standing straight, but the height of the shoulder conflicts with this.
As for the rest of the construction however, great job. My only additional suggestion beyond what others have stated is that your shading method is too... "cloth-like". Color diffuses across the surface in a fragmented, rough way, rather than the way light reflects off of more smooth/metallic/plastic materials. In the folds and contours of the material, like the impressions on the spikes of the gloves, the lightest shade and darkest shade should be closer, perhaps even next to each other. I'm probably not doing a very good job of explaining, maybe this picture will illustrate what I mean.
See here? Pay attention to how the highlight of the barrel meets the shadow on the other side of the barrel? Generally, with a shiny material, the neutral or inbetween shades are sparse, whilist highlights and shadows are very dominant. I think, assuming your figure is supposed to be shiny, you should try to emulate that.