Looking great although it seems to have quite a long neck. Anyway great work. I cannot really manage to get my pictures to look plastic and substantial if I don't have pencil lineart. It's not even the proportion. The stuff just doesn't look like anything than a colourful cloud in the shape of what it is supposed to be.
Talking about which, I have a lot more pencildrawings lying around that i wanted to turn into CS3 paintings.
Okay enough about me, I really like these, especially the middle one, maybe just because the other two are too monochrome for my tastes.
Really liking the middle iteration, it (he?) is gloriously creepy. The element of rust insinuating the colour scheme and the slightly more organic hue of some of the more internal structure is nice, and of course, the dead-eyed flesh face poking out from a horribly elongated neck just pushes it that much further into a disquieting tech/body horror place.
Great armour/mech design, form fitting silhouette but the plates and joints look like they function realistically. Makes me wonder how much is truly left of the guy in the middle...