Horse riding do I have good form?

You have a great seat and position, there's nothing much to criticize! Two things though; Try to keep your elbows bent and by your side. It isn't absolutely necessary, but your position looks much neater with your elbows at your side. Also, your toes tend to stick out whilst you jump. Again, this isn't a big problem, but looks much neater when your toes are in. You have good potential and you're a lovely rider. Keep it up. :)