I also thought she should have had a cameo in the second movie, even just as Harleen Quinzel at Arkham, maybe shown near the end during a scene admitting the Joker to the hospital.
I really like the collar and hood idea, how they are realistic in terms of fastenings and the hair falling out, but why the boob and belly windows? I realize that her acrobatic suit probably doesn't offer much in the way of protection anyhow, but still. Sort of out of character for her to "sex it up".
Harley has always been a fav character of mine no matter what incarnation she may have been in. So many different writers and artists have put their own slant on her look or manner. You have done her justice.