Your horse is gorgeous!!! And you guys look fabulous together! The only thing I can pick at is in the second pick maybe sit up a bit so you aren't slouching. And try not to bend your wrists.... I hope you guys did well!
Get your butt out of the saddle a bit more, lean forward, release those reins a little, a horse needs to stretch out to jump and land properly, wait let me get a link to proper jumping technique, allright here's one, look at the rider and horse on this link, oddly enough it's TrueColor's horse lol, but the rider and horse is near perfect! • View topic - Winner - 17.1h Polish WB stallion-discounts for 2011!
Congrats on you're first jumper show! I think you have a great base, your leg and seat look good. If I was to guess in that first picture I would say your horse got strong to the jump and to compensate you thought you would get your contact back early and sit down aswell so he didnt run on the other side of the fence. Lots of flat work will fix that, working on lengthening and shortening the stride with maintaining the same pace and a soft mouth. Another suggestion I have for you, if your going to continue doing the jumpers try out a running martingale instead of the standing martingale.
And remember thumbs up and heels down ;)