Lighting is definitely this image's weak point. First, it's too dark, and second, there are specular reflections with no apparent light source.
Meanwhile, I would give you more constructive criticism, except I can't see anything well enough to judge it. Sorry to be blunt, but the lighting is so poor that I cannot pick out what looks right and what looks wrong, because it *all* kind of looks wrong. It certainly has potential, particularly that robot, and I would LOVE to see & critique what you've done! Good luck!