Sci-fi Powered Armor Concept

I've been putting together ideas for a sci-fi graphic novel for a while now, and while I may not start actual work on it until I feel more confident in my skills, I put together this drawing of one of the main characters to see what my pencil sketches would look like with pen and GIMP. It's a bit rough, and I forgot the plates that're supposed to go over his legs, but I'm pretty satisfied with how it came out. It's amazing how much good a little shadow does. So, what do y'all think? Feedback, comments, misplaced hatred? I'll take whatever you wish to give.