Well, I think your jacket is just lovely. I would happily take a class on that!
I personally would think if you have a sample to hang, you could likely get more students. And I agree that a little longer style might attract more students. I would be interested in both learing how to modify a pattern to accommodate this type of pattern AND how to insert patterns like this using paper piecing.
I believe you are on the right track. Make sure that you have a clear idea of how long each step would take to teach/accomplish as the shop will likely ask that info to know how to market your class. I'd also recommend that you attempt to teach these classes in a local community education setting.
Your photo shows a very stylish piece. Good luck with it. Let us know how it goes!