Hmmmm. I think backing up a bit would have made a more interesting shot. I like your sepia tone, though. It works well on the subject. I would have lost the harness.
Interesting. If it were mine, I'd crop some more off the left side and increase the contrast. Posting larger would help, also. With the screen resolution set to 1600X1200, your image is about 2" tall.
I like the idea of using sepia for this image though it appears not to have enough contrast. The horse's nect at the top of the image is either overexposed or out of focus. This might be a question of depth of field.