Aw man, I really thought your stirrups looked great. =/
I think most of what I will say, you already know.
1st pic - It looks like you are bracing on her neck. Instead of doing that, grab mane, don't lean on the neck. It will really help you with releases too. It's what I do with Gabe a lot.
2nd pic - everything looks good to me. Just remember like everyone else said, thumbs up. Oh, and also, ask someone else, I'm not sure on this, but should your elbows be bent a little more? I've always heard you should have a straight line from elbow to bit. More like pic 4.
3rd pic - sink heels more
4rth pic - thumbs up, maybe raise your hands like an inch? MIEventer told me to never bury your hands in your horses neck, that they should be raised. So not quite sure about that one either.
5th - again with the straight arms.
6th - your stirrups do look long here. Sorry. =/ more release too.
7th - here you can really see the bracing on the neck thing. You have such a good straight back, you don't want to mess up your shoulders by leaning on her. I don't know if that makes sense.
8th - toes could go in just a teensy weensy bit. And yeah you seem to be sitting back down a little too early. Could of been a whole you thought she was going to take off early and went into two point and then when she did take off you were already sitting back down.
9th - resting on neck again.
So all in all it's all just really super minor stuff you have to fix, and then when you fix those you'll be kicking butt. :))
And maybe you can teach me how to open my shoulders and not slouch.
You guys looked beautiful out there on saturday.