This is gorgeous! I love the mane and tail, and I'm completely jealous of the water. I've been looking around dA for ages for a tutorial on how people make the water that drips off of horses in various manips, but there isn't a single one saying how. It could be really useful, and with how amazing you are at it, perhaps you'd be interested in making one? I'm sure may a novice like myself would find it extremely useful.
Gorgeous work. I did, however, notice that a) like others have pointed out, he doesn't seem to have a shadow, and b) maybe it's just me, but his horn looks a little weird... maybe it's the angle? It's very nice, though.
I think it's lovely except for the horn, his head is facing almost directly toward us, yet we see the entire horn, so it must have grown side ways :/ lol, but that's the only problem I see XD This one is probably my second favorite ( my first is definitely still the one you made me XD )