You did a great job at making it appear as though the horses are from that environment. They look incredible beautiful and the feelings that are conveyed from them are clear. I think it would help if there were more shadows added to this scene along with increased light on the right side of the sky. On the white horse the back hoof appears to have disappeared or was blended too much. I would suggest adding more rocks to the foreground if possible to give this scene even more depth. Overall you did a great job on this, as you truly capture the mood.