The mouth is great, very sexy!

I'd like to comment further, the shape of her cranium. More specificly the area above her eyebrowsk, which "should" be more distinct and not so rounded.

She actually reminds me of a girl I know. Oh, and I agree with the comments earlier about the ear.

Oh, and the eyes are a bit too wide apart. The ears should not, be a flat shape, I dunno how it really looks, but how about bending them a little outwards?

btw Great head!!!!