That's a robot... I'm surely, and about the art isn't bad at all dude, you're getting amazing skills in art area and so fast.
What source do you use? Because it isn't really bad, you can see that have some fails and the quality isn't best, but the detail and the mapping worked good, just try add new shadows and shadows for it, a robot head seems good with these things. Go ahead to sell it in the Texture sell art. And keep praticing please, you have skills.

Well, I get better and better each time I make a new head, I will sell it but not now