The head armour does appear to be the same shape as the horn. It's possible that he alphaed out the horn and then applied the armour over the resulting hole, although if that is the case he did a damn good job of covering the seam.
Good start! I think you're right to separate the hair out from the right horn more. The front bang would make more sense sitting on top of the base of the horn, instead of clipping through it.
I am huge fan of this!! Only thing to work on is in my opinion transition between head and horns. Maybe you could try to paint base of horns with skintone color? Anyway item looks great!!