Beautiful, classic, strong position! Anything we can say is very nitpicky and just polishing. As has already been said, bring your elbows in and give just a hair more of a release.
LOVE your strong leg position. Your stirrup length is perfect, your lower leg is strong, your heels are down, all of which gives you a strong base of support. I like that your eyes are up and already looking for the next fence.
The only other small thing you could work on is flattening your back and bringing your shoulders together. It looks like there is just slight curve in your back. Other than that, it's beautiful!