This is very unique composition with the hay in front of the horse, but I like it because it is unique and still works. It is almost like we are peeking around the hay into the world of the horse. Nice work!
The composition, and subject are wonderful. I love that you included the hay in the foreground which adds a nice textural dimension.
On my screen the sky is seriously pixelized. It is detrimental to this pic. It may be that your camera is giving you trouble, with low pixels, or perhaps in processing.
I like every things else about this. Some wonderful details like the wheel in the lower right corner and the beautiful, rustic fence.