Bah, this is full of energy! <3 All the shading looks in the right place -- the anatomy looks flawless, I actually can't see anything that sticks out. It all fits. xD
The curved horn, too. I think if you'd gone with a straight one it would've drawn away some of the vigour in his pose (not to mention straight ones are boring 83) because of the fact that it's straight. It might've ended up being the only pure straight line in the whole drawing, actually -- the result is as it is it looks really fluid.
That's a beautiful unicorn. :,D There is a very nice sense of action to this, and the unicorn's body is well shaped. The horn looks a bit crooked, but that is all (maybe he fought another unicorn with it and it got bent? ) Is he standing in water? The area around his hooves look almost like waves...
Thank you! If you mean the slight upward-curve of the horn, then that's intentional 'cause I personally prefer it over the ramrod-straight variant c: And jup, that's supposed to be water, though I admit to having gotten quite lazy with it in the end xD