Hmm..... This shows a lot of promise. The colors are great, and the blending on the wings is superb. The mane and tail both have good shape, just could use a bit more contrast between light and dark. Also, make sure they have shadows, both on the ground and on the horse itself. The wings could use some adjustments, perhaps locking the alpha channel then running a clone tool along the edges with a soft brush? It may get rid of those dark edges. The grounding could use some work... but I know how hard it is to blend on rock. :I I'm still trying to figure that out, honestly. Anyway, the only other thing I noticed was the shadow. I'd recommend using a gaussian blur on it, or just drawing one yourself. But overall, this is a really amazing piece of art. The colors, as well as the overall feel of it are wonderful.