I am a HUGE fan of Iron Man so it's kind of obvious that I like this piece of art. This is the Mark 4 suit if I am not mistaken. I quite like the detailing you did int the groove in his mask, revealing a few wires in the gaps. The proportions on this are spot on. I also like the fact that you put the Stark Tower in the background and if my eyes are not deceiving e there are people huddled together watching him from the roof, just above the letter "R" in STARK.
Great job as always...