Man, this looks good. I do have a comment on the side equipment plates and the belt. I think they are way too thick. I think they should be about a third of that thickness. The helmet and the chest plate cast look great. FOr the shoulders, did you do one cast of the entire thing or do you have three pieces? From what I can see of the right shoulder, it looks like it's in one piece. If so, WHY? That would seriously limit mobility.
I had to go through the entire topic again to see if there were any other pictures of the backpack. I saw only one on the first post. I want to see more of that yellow backpack you've got at the back. It looks good.
Excellent work overall.