I love the ears, and the fluffy details you put into her coat, I feel they're distributed nicely over her body, not too many, not too few.

The only thing that bugs me out is the part where the back becomes the tail, it looks like it shouldn't go down as far as you drew it by the ribbony-bit around her tail, but I have no idea about horse-anatomy, it might be perfectly fine XD



I also love the background, I hate drawing them, so I always admire it, when someone gives a portrait-like picture such a nice and detailed background, who fits the overall scene well. I love the moss details on the tree and branch btw.