This is really lovely! I just wish you had more expression to the face, it looks so blank, almost zombie like with the mouth and eyes. I understand you don't really like default mouths, but even just a small smile could go a long way. Also, the legs are a bit bare. I know you aren't going for perfect matching, but about this combo? The stockings would add a bit of nice colour to the super bare leg area and the ribbon would break up all the white at the chest area.
All in all, I'd give it a 7/10 as is (just a little fine tuning could get it higher). It's really lovely, I like the theme, colours and items used. I actually don't think I have seen that hair used in an original way in a long time. If you wanted to add a bit more to the avatar, a background from Scenic Quest could work nicely. Also, the staff from Seracila Pendant would look gorgeous with this, but that's just personal preference.