Robot sketches

I was asked to do a design of a cute, perhaps approachable (read: no laser eyes or chainsaw hands) robot for illustrative purposes.
My illustration skills have certainly improved since the last time I tried sketching ideas (not the craft, we're talking WAY in the past). Which one do you thing is the radingest robot of them all?

I've completed a pixel piece I want to put up, but I'm waiting until tomorrow to finalise before I put it up. I'm also going to be working on my time management skills. More efficient! Yay!