the head's great, but everything else is like "WTF."
As pointed out, the shading on the torso doesn't make much sense, but I think you should work on your line art a bit more before continuing. The arms are really inconsistent when it comes to thickness, both along their own lengths and when compared to one another. The shoulders look different, 'cause the near one doesn't overlap as much as the far one. Oh, and the way that far arm overlaps the leg is really...wierd. The top of the torso looks pretty wierd, too. I know it's not human, but that pose looks uncomfortable...especially how the legs flare out like that and the way the head is so far back.
What kind of stance were you going for? You should definately have an idea of what you want your character to be doing before posing him, and then, make sure the pose makes sense. Right now, I can't tell what he's supposed to be portraying: Heroism? Readiness? Surprise? Robotic Emotionlessness?
You might also want to redo those hands. They're kinda iffy. Unless you're actually making a human, you can take some shortcuts when it comes to the amount of fingers a character has.
Honestly, I don't wanna sound pessimistic, but I would consider redoing everything but the head. Start out with a solid base pose and lineart, make sure you have a designated lightsource and an idea of how each surface of the robot will reflect that surface.
Really, though, I do like that head.