To be honest, you've sort of screwed it up. You need to learn how to do smooth lines, them lines are all small straight lines and it looks terrible, fix the blurred part near the middle and don't rush into black from a soothing yellow, it just doesn't work. Also, I don't like the blood and the black X, it just isn't in the style at all, it's meant to be somewhat robotic. I mean, copying and changing other heads isn't a good way to learn texturing at all, just look at flats of heads made by epic artists and try to discover what they do.