I have to say - you have pretty amazing equitation my dear! Also, I love European style of riding!
The first thing I look at, is your lower leg - that is the most important factor to solid equitation while jumping.
Your's, are pretty darn good, minus a few faults! Solid at the girth, no knee pinching - fabulous!
Then I look at your seat - WONDERFUL!
Your seat is centered over your saddle, exactly where it should be. And you allow your horse to lift you out of your tack, instead of you lurching yourself out. GREAT!!
Your back, you do roach it a bit, but I think it is because you are going into self defense mode, on this very forward and strong horse.
Shoulders - same - self defense mode, but that plays into effect with your lower back.
Release - your release is like mine, lol - non existant.
Your center of gravity, is with your horses motion. I LOVE IT!
I would far wrather see a rider where you are, over fences - than seeing riders with lower legs flying back, knee pinching and throwing themselves over their horses shoulders.
Your leather length, could go shorter. Yes, you are solid as it is - but to better aid you to be that much more effeciant, shorten them a hole or two. By shortening your leathers, you will aid yourself to stay off of your horses back while over the fence, and prevent you from landing in your tack too soon.
Our horses backs are very sensative, and we want to beable to free their backs for the correct length of time, to aid them to jump with freedome and bascule, without interfearing them.
By you shortening your leathers, you will aid your gorgeous horse with this.
Also, your iron should be placed at the ball of your toes. Right now, too far back *looking at last picture*
Smidge the iron under the balls of your toes, and the outter bar of your iron should be at your pinky toe, while the inner bar of your iron should be at the ball of your big toe.
Now - also, by shortening your leathers and correcting your iron placement, your heels can do their job - which is absorb all your bodies energy, and anchor you - although you don't need aiding with anchoring you...because you are darn solid as it is...which is great to see.
So for you - correcting your leather length and iron placement - you will aid your horse by being stronger, to remain off of his back while over and landing the fence.
Your release - is just as good as mine....which isn't that great. LOL.
I see that you are a very handsy rider. I can understand because you are on a very energetic, powerful, forward horse - and you are in self defense mode and "must control" mode, so you resort to your hands.
I would recommend lots more flat work. But learning to ride back to front, instead of you riding front to back. Really work on riding seat, to legs, to hands to soften.
Your seat comes first, riding the back end. Then your legs aid by lifting and supporting, and your outside rein allows that energy to recycle back through - so you can aid your horse to rock off of his forehand, and onto his back end.
I see nice carried hands - but learn to soften up your shoulders, elbows and allow your upper body to be giving, softening and quiet.
Right now, you are stiff, tense, holding, holdin, holding. You have wayyy to much inside rein....learn to soften that inside rein, and drive inside leg into outside rein.
Teach your horse to carry himself - through seat into legs into outside hand. Hands come last, seat comes first.
In your vid - after the too fast 3 jump combo...at the end, see how he softened up, when you softened up?
You have a very solid seat!!! VERY SOLID!!! I watched your video, and I LOVE, LOVE, LOVE how your seat is in your tack, tall upper body, carried hands - LOVE IT! You have so much going for you, and I think you are very capeable of fixing your minor errors - you just need to learn how to....that's the hard part.
Really go back to lots of flat work. A stronger bit *mechanical hackamore* will must the issues for a short time, but eventually they will rear their ugly heads. You have to fix the issues now - flat work, flat work, flat work.
You have the tools! You can do this! I am sure you have a very capeable coach, look at where you are now!
I think - if you were to send this picture to George Morris - he would have lots of positive remarks. I bet one of the only things he'd speak about is your too long of leather length and iron placement...and heels.
Remember, the bigger the fence, the shorter the leathers. Correct leather length, aids the rider in being efficiant and functional.
Also, you are very capeable of doing Automatic Releases! You can definitely support your upper through your lower -
I understand that european style of jumping/riding is much different from North America. Here Hunters is very strong and implimented into our young riders...where there, Hunter style of riding is non existant.