Okay, a few things. First I really like this horse and his attitude. He doesn't rush up to a fence nor does he seem reluctant at all.
That being said, I'd really like to see you give him more of a release over the fences. In the photo, there is a slight one, but not enough for the height of the jump he's going over, and in the video (which I know you said was from a while ago) there is basically none at all. This can cause all types of problems, but especially when you get to going over larger fences, a lack of release can actually pull him down while he's going over and cause injury. Also, when you give him his head while he's jumping, then he will be more inclined to flex and give you a nice frame in between. The other thing is your leg. When you are cantering, it wiggles and when you are trotting it is everywhere! The leg should be still, no matter if you are posting or cantering. A good way to build leg strength is posting without stirrups and standing at the trot. You will be amazed at how much better your ride will be without all of those extra unintentional cues you give him every time your leg bumps him.
Good luck with him, he really is a beautiful horse, and fits you very well. Can't wait to see more from you two in the future.