His back looks like it has an indent. Maybe want to work on the back.

Interesting, thanks, I got the point, though for me it actually looks more like an opposite part (:

{ You could try something like this for his back...

 yeah.. the back is creeping me out, looks like he just got squashed by a cinderblock. :|

Some bobbing with the down and up walkcycle, simular to the side-to-side, would look awesome. The back looks quite awkward, also. Good job though, this is quite nice!

 something is very wrong with his back... why is there a huge dent in it?

Yeah, thanks for the mention. I guess that applies for the armor too in some way *thinking* Well, I'm not good in animation actually.

 I really like the walk cycle. The anatomy is kinda off though. When he moves his arms, the muscles in the chest and back should contract a bit.