Looks good to me, but other than SFG II I have never used windmill very much. Others may have more to say.
What I see is that your alignment is good, you're pushing into the back hip (good, but possibly could be more), your loaded/back leg is straight (maybe could be slightly straighter), your spine is getting good rotation in the t-spine area and not bending to the side when you come down (good). Try to load the back leg as much as possible. I think the repeated Pavel advice is to pretend the front foot has an egg under it and you don't want to break the egg. The front leg can be either bent or straight, while the back leg is straight.