Awesome edits, thanks guys! It's really helpful to see other people's take on the same reference image.
I now have a boy and a girl robot with subtle difference between them:
(http://i.imgur.com/fVDKVFU.png)
I was going to post how they look in game when I discovered that I'm a dolt. Apparently my code had been stretching out my old 32x32 filler sprite to a 48x48 canvas :D. I've got to go back and scale these guys up a bit. I'll probably post some edits later tonight