In Photo 1, your horse looks like he's a little off balance coming out of the corner...but then in Photo 2, he looks VERY balanced and is moving VERY nicely! Maybe it's just a bad photo angle in Photo 1. =)
As for your riding, I'm a big huntseat equitation fan, so I may be a little off for the Dressage world. But it looks like your hands are a little too flat. Like, the backs of your hands are facing the sky and not "thumbs up" enough. I've always been told that your hands should follow the slope of your horse's withers. Hard to explain! Also, it sounds like your horse is in "serious training" so maybe you're concentrating more on him than the angle of your hands!!
Also looks like you have a good secure seat.
I like how your horse is stretching down in Photo 3. That will really give him an opportunity to lift his back and loosen up. Do you allow him to do this on a loose rein too?
I agree with the others that you need to have your thumbs up, not only on top but think of giving a half thumbs up (its hard to explain without showing you!) The end of your thumb should rest on the middle knuckle of your index finger. Also, bend your elbows and think of putting the weight in your elbows, this will help when he gets heavy on the bit, and keep your hands soft.
In a lot of the pics he doesnt look like he is using himself that well (its hard for a horse to carry themselves and takes a while for them to build up the muscle- im not saying he is trailing, just he has some room for some improvement :)) Think of driving him forward, DO NOT worry about his headset, he will naturally come round when he is able to carry himself.
To help him do this, make sure that you are engaging your keagle muscles (bottom ab muscles, also the ones you use to hole your pee in :P) this will help him to engage his and carry himself better.
You have a wonderful seat, and I absolutely love the third pic where he is stretching down, and you can see his back coming up.
Good luck in the future, he looks like a great ride!
Thanks everyone, my hands have been an issue for a while.
Thanks for the tips I can't wait to go ride today and see how he does.:)
He is still learning so he's a little un balanced and JUST learning that the bit isnt going to kill him and to be relaxed lol...
Thanks again everyone
Agree with what's been said so far. Lifting your head and rolling your shoulders back will bring your arms and hands into a better frame by default. Its a habit I get into also: you get so into the horse, your upper body starts to collapse in. Get in a habit of constantly checking this in your head while you ride.
Your horse is looking good, pic number 3 is very encouraging:) Work on really getting him to reach under himself in the trot, he's not really using himself in that gait yet.
Your horse and posture look pretty good. Try moving your hands off of your horses neck and a little more away from your body, this will make your hands much softer and more comfortable on your horses mouth. :)