Very nice work, think you've done a cracking job on the miniature and horse.
My only criticism would be about the back banner. Think this guy would get up to a trot and would start to struggle a bit, into a canter and he'd be pretty much pulled off the horse by the wind resistance.
In the picture it looks more like it's a piece of cloth (which would be feasible), what material have you made the back banner out of perhaps could you ruffle or bend it a bit to make it appear like a fabric?
Otherwise top job though it's a lovely looking mini.