Looks great. The arms and thighs look a little weak in concept compared to the armor segments. Could use more basic shapes for anatomy, which I'm sure will come through when you start sculpting. All together, looks nice.
I like alot of the armor design, especially the points coming off the knees...mean lookin'. I think the forearm armor in your concept looks alot better than what you have done in 3d, has more of a solid shell feel(in concept) and flows with the arm anatomy alot better. I think you definitely need something on the bare arm…