this is the best picture of the lot, imo.
Because he looks like he's putting his head where it works for him, not having it pulling into place. He is ovbiously much stiffer going right. YOu can see it's very hard for him to put any kind of flexion in his poll going to the right, and he is less able to step under himself, too.
Strangley enough , going right his inside rear and outside fore do not strike down evenly together, as they should. It looks like he is blocked on his inside shoulder, which is making him pick up his outside shoulder sooner than he should. I am not sure I have this all correct, but the pair , which are the second beat of the canter sequence, are not synced well going right. I have a feeling that he feels blocked on his inside shoulder, and you may need to work on some suppling to "break" up that stiffness.
I might actaully do some full , western style disengagemenst, especially to the right, so you get a big step under with the right rear. And look to have him flex at the poll to the right, at the jaw, so that his face stays vertical. Work on having him do this flexion at the walk, then the minute he does it, lower your hand to his wither to see if he can carry it by himslef.
When you are cantering right, you end up pulling a bit hard to get that inside bend, and it compresses his neck down onto his right shoulder, and that's waht I mean by "blocking him". If you can train him to flex and hold /carry by himself, then you won't be blocking.
Also, in dressage, don't look so far around your turns. look no more inside than your horse's inside ear.