Iron Man's Extremis armor is a pretty tough armor to illustrate. I generally have to understand what I am drawing before I tackle it and for some reason i can't wrap my head around this armor. this was the second time I ended up drawing him. The first two images are my complete workings of the character. the image below is colored by Doug Stevens who has a profile up at http://bdstevens.deviantart.com
I really want to get more comfortable drawing Iron Man but I think I will do so in the context of drawing him with the Avengers when I do draw him.