The lines are grossly sharp.
Try smudging next time
Dodge and burn tool will help.
3/10
Mapping is a bit off i think.
Well, if you upload that texture, the face would be wide. And yeah try cleaning it up.
Try a asymmetrical robot, like when you're fisnished, add some scrathes. by the way, the face looks like the Predator's mask. 4/10. I don't like it, but I don't hate it either.