I think your style of robotic may looks better if you put some outlines in the middle of the plates, will give deepth effect too.
Try to raise the visor a bit and will be good.
I like the colour theme, and the back mapping looks pretty nice!
the eyes or what ever is that is too low
add more details on the top of the head and the face
fix the lines and make them clear
drink some apple juice while drawing
I'm gonna have to agree with him ^^^ the eyes/ visor do look a bit to low and also in the back of the head the platting looks a little sloppy and there are to Many plates the head looks like it's supposed to be "simple" but there you have lots of small prices