Potential?

This is my nearly five Quarter Horse, Scooter, and I was wondering how much potential we had in the Jumper Ring? This is a video: .::Wings::. - YouTube

These are mostly not approach or land, but the jump itself. What should I work on?

Your distances are a little inconsistent. Now, that being said, I think he's got a lovely jump. There are a couple shots where he is able to square up nicely in front.
I definitely see a 3ft+ with proper set up and training.