Great animal portrait of the trio of ponies. Serendipity was in your corner that these three ponies are lined up in such an order that goes from light (white one at far left) to dark (the dark brown on the far right). I like how one sees the environs that this bred lives in with the snow on the mountain grounds in the backdrop. My only observation is that I wish the opportunity (or mayhap it did) presented itself that all the eyes of the ponies were more visible - the one on the right end has it's eyes obscured by the hair of the mane.
Indeed, they are beautiful, all 3 of them. The left one seems a little shy, the middle one is the model of them and the right one doesn't seem to care very much what you're doing there :)