Congrats on your first show.
Like Erika said, and your coach noticed, you really need to shorten your reins. You don't want to be bringing your elbows behind your back to steer and stop. It was causing you to stand up and tip forward. Probably why you didn't pin higher in the EQ class.
Your horse is lovely... such a good match for you! And you two are so nicely turned out. If you want to turn up the polish a bit more, tuck in that strap on your helmet and wear jodstraps to pull it all together.
If your horse says no, you either asked the wrong question or asked the question wrong
And God took a handful of southerly wind, blew His breath over it and created the horse