This is so cool. I like the contrast of colours between Iron Man and Iron Monger, and the shading is excellent. The perspective is also great. If I could make suggestion, I'd say that the angle of Iron Man's head makes him look a little unfocused, but other than that, it's awesome.
Hi, I love your work =] Just got myself a graphics tablet and looking to any sort of help in doing this sort of work, do you know any site or any tips yourself that may help in this kind of digital artwork?