I love the expression on her face. The boobs seem like they are sitting on something the bottoms are a little too flat. If that string is to be holding them up from the bottom they should bulge out a bit on either side of the string.
I think it could use more antialiasing around the cheeks. Edited her right cheek: http://i39.photobucket.com/albums/e199/sharprm/anime.gif I really like the AA in panda's pieces but guess thats just a personal preference: http://www.pixeljoint.com/pixelart/28192.htm#
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you are ruining the beautiful with anime..