The second picture, he is skinny and looking at his right front leg he looks bowed..I need someone else to look at that and see if they see it also or maybe its the angle?
Third picture, Im a big fan of the "old" fashion hunter..I like the level head. I noticed in your first picture he holds his head high also..are you a hunter? If so try working on lowering his.
Fourth picture,(i can't pick out things bareback-ill let other people decide lol)
Fifth picture, it looks like you could move your hands to the middle of your horses neck more and that your butt could be pointed back more also.
You look great! Keep up the good work!
There is no secret so close as that between a rider and his horse. ~ Robert Smith Surtees