Two .psds, though lots of merged stuff on both.
So this one was quite arduous if I remember correctly. Lots of chopping and hacking and sawing. The odd light glowiness of the second was me changing the blending mode of the texture layer of the first parent to something else (probably screen).
Both got hair because I was so not drawing in the back of the other horn, and I wanted the other horns to be mixed with the hair.