This really reminds me of those Splash-arts you can see from game developers, an amazingly "cool" feeling. I especially LOVE the concept of a Robot with a unique appearance, I mean, you can't first tell that it's a machine underneath the armor and clothing. The details show it how ever, and those details are amazing, cause when you start looking at, for example, it's chest, you see the wiring and metall pieces almost hidden, but still visible enough to show it's actually NOT an organic being underneath.
I would say the only thing that buggers me are the feet, something about the positioning of the fore foot and the scaling of the two feet together seams slightly off. But it's not enough for me to actually dislike it, not close enough of a reason to hate it..
So, all in all, GREAT image