Looks very good. Lose the tampon though (that's what meatheads like myself call the bar pad ). I don't think you are too extended, you want some back extension at the start. But that means you are getting slight wink at the bottom. Try some RDL training to lengthen your hammys. Also, experiment with adding a bit of external rotation to your thighs and driving the knees out more. But those are just things to play with, form looks very good (albeit with essentially no weight on your back). What surgery did you have? Video from the front and side would be helpful. And yes, excellent choice of attire. :thumbsup:
Edit: Not to be a creeper, but the back extension issue could be observed a lot more easily if you can post a vid while you are wearing a sports bra or something that exposes the lumbar region at least. The wrinkles in the shirt make it hard to evaluate you actual back position/tightness.