the right side was fine before and the contrast was fine. what you should trying doing is take a white soft round brush with a decent size that almost covers the head.. make a dot at the top of the helmit- glaussion blur it- then set it to color dodge. that would give the render enough lighting imo.
I like v.3 the best - but I thought the biggest problem for you was the text - I like how you tried to be creative - but the Irons text doesn't look good skewed. The color isnt that good either.I think u should redo the text totally with a new font/colors.Other than that - the sig is maybe one of your best.
font is a hard thing to judge. not many people can get it down perfectly but the best way is to just keep testing them out. I cant really help out too much with text because im not good at it.