1st - obviously another boring robot, but then the request called for hair which makes it look horrible, the color of it makes it stand out and draws all attention to it, love the color choice though
2nd - robot, bore. i hate your shading for the fact that you always use some light blue instead of giving things glow with the color they are. i know these are requests but at least make them have some uniqueness to them. they blemishes on the front are nothing more than poorly done and gives no show of 'injury' to the head which it seems you were trying to do.
3rd - robot, great. boring colors, you started slaking on the shading and you blew the glassy effect. horrible job, in my opinion, it just looks like smudges on a black surface. once again, weird blue shading.
still nice pieces, just not amazing.