The ironman one is the best imo. The other two need more of a foreground. Might want to add some better blending, though.
Iron man 1 is good but i think colors should be more distributed/random instead of SLAP this side is YELLOW!!!!, and SLAP this side is RED!!!! blend them together more and i think it could help the flow of the signature out. Already commented other 2 in a another post <_< so im not gona repeat myself onthose. As far as iron man goes. Make it flow more 7/10