I definitely have to agree with BeauReba. It was the first thing I noticed as well. Especially for jumping a helmet should be worn.
As for critique... I think you guys look very nice together. Try not to cut your corners as much. Keep your eyes up and plan ahead. Try not to think of the jumps individually. Plan out your course as a SERIES of jumps, not just one jump at a time. I don't think you have bad form at all.
Back could be a little straight though, and loosen your reins a tad. It looks like you are holding his head too much. You have a very beautiful horse. He looks like a natural jumper. Beautiful lead change! Although, try to keep him straighter across that diagonal. More pace is needed, as he broke to a trot in that one corner. But all in all, I think you guys look really fantastic! Good work!!