Actually it has fins on the back but u can't see them here but I made them out of sculpting material like the ears

This is really good work. Like I've said before, The 3 3/4 inch is a royal pain in the behind to work with, so you've done a fantastic job. Captain America is a good choice of base (the belt is practically Batman's) and the paint is very clean and professional. Perhaps you could glue on some fins to the gauntlet, out of cut vinyl? Even without that, this is good.