I Am Iron Man

I decided to take a look at your piece after seeing Juggertha's Iron Man image.

The line work is sharp and clear and your details are easily readable, and I'm envious of your overall control of traditional tools--not enough of that used in comic art these days. However, one major issue you have going on here is that all the red is blending together too much, making the composition look flat. You would have been well off shading it a little lighter on his hand (especially since they're generating their own light sources) and changing the background color so that it doesn't flatten the overall composition out so much.