Congrats on your show and you both look wonderful together. What a beautiful horse, and clearly loves the job at hand.
Lets start off with your first picture -
The first thing I always look at is the riders seat. Where is it in accordance to their tack?
Then I look at the riders legs, beacuse that effects their seat....where are their legs placed?
Then I look at leather length, iron placement, and heels.
Lets start off with your seat - do you see how far out of your tack it is? Look at your crotch - can you see where it is located in accordance to your saddle? It is over, if not surpassed, the pommel.
That is a huge sign of a rider jumping ahead of their horse, the biggest error/fault/mistake so many riders do - because they aren't being taught properly by our lower level coaches of today.
But - lets ask why you are jumping ahead - there are a handful of reasons that are at play here.
1) Incorrect leather length
2) Incorrect iron placement
3) Knee pinching
4) Anticipating the fence
5) Racing to the fence instead of allowing fence to come to them
6) Legs not doing their job or legs not being allowed to do their job
7) Riding the fence, not their horse
8) Not allowing horse to do their job
I cannot see your leather length well, nor your iron placement - nor your heels.
But I am going to assume all of the above is at play here.
I do believe your leathers are at the correct length, I looked at your 2nd photo and it does appear that you have a 110 degree angle in your knees. BUT I do see, that you are standing up in your irons, not allowing your legs, nor your heels to do their job.
A riders legs are a huge factor to solid form over fences. If your legs are not where they should be, you have compromised the rest of the links in the chain of solid form. BUT your legs cannot do their job, if your tack is not aiding you. As stated, your leathers are at a good length, but your iron placement is not.
Your irons should be at the balls of your toes, where your outter bar is at your pinky toe and the inner bar is at the ball of your big toe. Now, your ankles can move and your heels can do their job - which is anchor you in your tack.
Once you've corrected your iron placement, work on allowing your bodies weight to flow down into your heels. You cannot pinch with your knees, because that blocks that flow that needs to occur - you cannot compromise your heels effectiveness. They must be permitted to anchor you in your tack.
Now - your legs are not stabalized. I am going to really recommend you do allot of 2 point work. Get those legs at the girth, and lock them there. You are riding on the back of your calves, which is incorrect - you need to ride with the inner parts of your calves.
Train those leg muscles to where they must be - at the girth. Train your legs to wrap around your horse - remember, you need to be wrapped around your horses girth to support, lift, aid him, while securing your form. You are not ontop of your horse, you are around your horse. Get those legs around your horses girth.
Now - we can fix your jumping ahead. See where your seat is in the 3rd picture - see how is it low to your tack? See how it is over the center of your saddle? THAT is where it SHOULD BE - and by correcting your lower body, you will aid this immensely.
Alright - so lets move to the other reasons why you are jumping ahead. You are anticipating the fence, racing to the fence instead of allowing it to come to you, and you are not riding your horse, but you are riding the fence.
YOU know that fence is there. Your horse knows that fence is there. Everyone else knows that fence is there - so why focus on it? It is little, easy peasy and just a blip in the way.
Stop focusing on it! Find your focal point beyond the fence and learn to ride your horses rhtyhm. Focus on the most important factor to this equation - YOUR HORSE. Focus on his rhythm, focus on his tempo. Focus on where your legs are *at the girth wrapped around* and where your heels are.
Your job is to get your horse to the base of that fence in a safe, rhythmic, fluid, strait movement. His job is the rest. You cannot get him over that fence, so stop trying. Trust him to do his job.
You must support him to that fence, he must do the rest.
Another reason why you want your legs at that girth and wrapped - is so that you can aid your horse and support your horse. Lifting his back, keeping the rhythm and impulsion, and - you continue to ride your horse over the fence.
The moment you loose your lower leg - you stop riding your horse. If I do that to my TB - he stops dead in his tracks saying "oh my gosh...where'd you go? I can't do this all on my own"
Ride your horse, not the fence.
Work on allowing your horse to lift you out of your tack. Work on allowing your horse to close the angle for you.
Also - when you jump ahead like that, you've now made your horses job that much more harder. See how all your bodies weight is on your horses shoulders? You don't want to do that - you've now interfeared with his job. You want to be always over your horses center of gravity - remember, aiding your horse - you are partners.
2 point work - lots of it :) Ride your horses rhythm - ride your horse, not the fence.