I think that looks gorgeous! Really well done! I love your super long back leg, and your easy, pointed toes. Nothing too formal, but still graceful and lengthening!
If you really, REALLY want some constructive ideas, I would say that arching your back a bit more (if you can! Depends on how comfortable you are, your bendiness, and such), and also bringing your arms closer to the floor a little more, trying to make them parallel with the ground, and really reaching through your hands.
BUT, I still seriously thing that this is amazing. You look great! Personally, I would just celebrate the achievement (you said you’ve been working your butt off on this move!) and work it into your dance, so that you can bring it into your regular repertoire! This move makes you look gorgeous, so remember that! Doesn’t matter how arched your back is, how straight your leg is, or what your arms are doing- you look beautiful!