Very Nice
OVer all there isn't much I can say for this.
It is really pretty good. The only things I do have to say are pretty small.
The first one is what is up with that black block?!
I mean at the top of the picture you have this block that seems to be 100% black and the rest is like a 90% black. At first I thought it was some sort of gradient, but nope, it just suddenly changes. It's kind of awkward.
I think you could have pushed out some more reflections and hard highlights on the visor and gun. It would have given them a much more shiny feel.
On the subject of strong highlights. In some areas you have the armor roughed up quite a bit. I think you should have added a couple spots in those areas where the paint would have chipped off and you would have the metal shining through. All just to add some more appeal and make the armor look more worn.
Still, very nice piece.