Here is what I noticed:
1) Hands are very wide on most pics, on 3 pic right hand is higher than left, on last pic looks like the right hand goes over the withers.
2) Not a straight line for elbow-hand-wrist-rein-bit on most pics (I'm working hard on that too with my horse :) )
3) Looks like you are leaning inside on 2 & last pics (although I may be wrong on this one).
You have a very lovely horse, which seems to be build really nicely for dressage. I'm jealous....