Please see 360 view here:
Please see my other Sonic work bellow:
Sonic and Dr. Robotnik are copyright SEGA
What's interesting is your design gives the impression he ALWAYS had black and red eyes, they look organic. I don't know what is creepier, that he once had ordinary human eyes which he replaced with cybernetics or that he's simply born with black and red eyes, I mean if his skull is that shape, then I guess he is a mutant in general.
Like I said: He is the best version of Robotnik in my opinion.