Your horse is beautiful!He really listen and repsonds well to you and your very insync with eachother!
What I see that would help is that you need to lift your handsa good 5'' higher, right now they are in your lap, quiet and still but in your lap....even going over the small jump. The jump itself being so small and your horse taking it smoothly makes it so you don't need a big relase but, stearing and a small relase are needed so you don't catch him in the mouth.
Beofre you pick up your reisn think about loosening your supper bpdy up....lik wet noodles, shake your are out, twost side to side arms out like aireplane wings then up to the sky and do shoulder circles, this will all help keep a soft bend when your hands come out of your lap, you will need to shorten your reins just a bit when this happens.
Because your hands are in your lap, and though your hands a nice a quiet they are pulling down on him and that's why his head is in their and neck looks pretty braced.
Is their a feild you could ride in other then this little area you are in?
All in all you look good and very stable. I think your legs are at a good place os that you can get more of a wrapping senstation around his barrel and seems he steeers off your seat pretty good?
The minis are super cute, the little one running around when you go past is too cute!