I like the palette. The thing coming out of the top of the head, not sure what it is. To me it looks like its a block
with some kind of perspective. If thats the case, you should probably get rid of the perspective, because the rest of the robot
is straight on. If they are buildings in the background (you can keep perspective) but maybe you should use lighter colors to help distinguish it from the robot. I really
like the head and chest, but his right arm is not as good. I don't think the top section is shaded correctly. Also it seems too short (it
would be useless at that length).