Good style! I like the interpretation of those guys.
For the EMPRAH!
Love the chunky depth! Might be worthwhile to add a few pixels of highlights on the far arms, just so they don't get lost. Maybe like a line of your mid-blue across the bottom edge of the shoulder plate?
I'll agree with cure (who am i to do otherwise ;P), but the left one has a thing on his back which doesn't look perfectly centered :S i don't know if this is what you were trying to achieve, if so i rest my case :P.
Cool metal effect though.
the completely darkened far arms look odd. i get what you're trying to do there, but I don't think it's working. also iffy on the square highlights, rest looks nice though.
Imperium of pixels.