Im pretty sure I've seen this without the shoulder mounted weapons and text, oh and different Iron Man colours before, so with what you actually did do, I dont know what to say really, erm, I dont like the text for starters, and I the minigun looks copied and pasted on because of the detailed badge underneath. EDIT: So, you didnt add the minigun, however; yours looked oversharpened.
Well, you seem to be getting a little better, I noticed you blurred the background too, which is a good move except the background was already previously blurred.. The Text doesnt line up with the Mini-gun properly so you might want to work on the angle of the text. I like the smoke along the bottom however, its a nice effect and I can tell what you were going for. Are you still using Paint?