Alright I'll start :) First of all you both look lovely together and a huge congratulations on winning :)
My first nit-pick is you have some very rigid hands, a solid death grip on his mouth with a pretty darn strong bit. A few times he gets upset and offers a good head toss. He's clearly worked up and excited to get going. I think what would benefit you both some would be easing back on the heavy bit and practicing walk/trot trot/walk walk/canter canter/walk trot/canter canter/trot transitions, a billion of them using as little rein as possible - first without jumps then when you feel he's transitioning like a doll with you just shifting your weight in the saddle add a jump, then gradually add more. You're clearly relying a great deal on your hands to control him.
To add to that - when you're jumping I see almost no release at all, you're hands are just barely an inch out of your lap over the jumps. I'd like to see your hands much higher up his neck over the jumps. He's checking himself in the mouth every time he tries to jump.
I think you are both lovely and did a great job, but I think you need to work on softer hands - and hopefully eventually move the reins up a ring or two on the bit. Practice your transitions until he's reading your mind -regardless of the bit :)