Looks awesome, but 1st of all, all the ab buttons need to be black.
Also My personal opinion is that you need more weathering (black acrylic wash). When you think about it, If the paint is that beaten up, it would most definitely have been in a few battles, and battles are dirty! I also think there is a little too much paint chipping on the helmet, sort of takes away from the design... but once again thats just my $0.02