I only touched the shading aspect of the red area, but it has a lot of other problems. I should have probably put more contrast into it, and the highlighting I did is pretty piss-poor, so excuse that.
The design seems overall very boring, and the lines are not very smooth. The top of the shield, I think, is mostly taking credit for that problem.
Also, try not to use fully saturated colors... they can burn the eyes. Drop the saturation down a bit(I think I did so too much), and never use pure white/grey, add some slight color into it... blue, for this, since it's metallic.