I love it, and think you did a fantastic job with the light you had to work with.
I might wood try to clone out some of her fly away hair.
I tried a few different crops on your shot, the best I could come up with was just above the horses ears, and just below her elbow. I didn't like it as well as your original shot, because it seemd the horse overpowered the shot.
I'd love to see the rest of the shoot
