I'm sure many voters just zipped past this as a "snapshot" but I quite like it for the interaction you've captured between the horse and the trainer. May not have been intentional on your part or theirs, but it's what came through in the shot. Better picture than it scored.
Good exposure and colors. I think more room at the bottom (so the horse's and jockey's knees weren't cut) and less at the top would have made it feel a little more complete.
Since you don't get all of the horse's legs anyway... I think you might have cropped tighter here for a more impactful image. Also looks a bit light to me.