You're looking very nice! You lower leg position is great.
I think you have to be careful with holding onto the horn, as you don't want to be pulling up with your arms. I think you look ready to let go. You could ask to go onto a lunge and have your arms out to the side of you to gain confidence :)
Learning your diagonals would be a good next step for you too. (Rise and fall with the leg on the wall), so when the outside front leg goes back, you sit.
Your posting is in a nice rhythm, you should be proud of your fast progress!