I think Rere might have got an incomplete image load (ie only half loaded) for some reason - ergo the cut in half feeling.
Certainly the shot does not look cuttup; I like the composition and the fact that you have the attention of the horses. Its perhapse a little dark in the shadows, but the highlights are well controled - and the lightly darker look has what I feel is a more filmy look than digital. I would try a little bit of selective brightening on the darks, but not too much.