not bad by the standards of comic books. Not sure what the lines under the eyes are meant to represent; they make for odd cheekbones. But not bad at all.
Not good by the standard of Rembrandt, but you knew that.
The composition is a little 'flat/passive': considering the content, better use of angles would give an impression of more depth and would make the image more dynamic overall.
you've got a woman with pink leggings and a blue chest hurtling in from outer space in the top left hand corner, and you want something more dynamic?
She does actually look as if she might fly straight past behind the droid; their lines aren't quite converging. And she might need to be further away to account for the difference in scale between her and the guy.
A couple of the dents in the robot look like boils,( ie convex rather than concave) probably due to highlights being wrong.
Apart from that, very good.