Yes, I thought that the horn was hidden under the helmet at first, but it clear he has none. So it could be that he has not ascended to Alicorn or is a half-brother to the Prince. As to size, well mythic creatures that use magic, and are of a higher celestial nature are often depicted as androgynous. That is the beauty of fantasy art, it exercises your imagination. So till the artist tells me I’m wrong, I stand by my conception. Have a happy.