I think the bottom lip has to come up more over the top teeth. If you smile, you'll notice that your bottom lip touches and comes up over the top set of teeth just a smidge. And I would thin the top lip too, bring the center of the top lip down a bit (or better yet the sides up) and wrinkle the nose slightly :o).

Just my thoughts ;o).

Pretty face tho and nice skin! And I LOVE it that she has a normal nose and not one of those teensy weensy abnormal ones (that usually come with thick flabby lips...LOL. Bravo. :o)