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I really like this piece. The focus is spot on on the top lip, drawing the viewers eye down through the piece. The parted lip's give the sense of allure, though I think that the photo has been cropped too tight.
If you are going for an alluring feel to this piece then either wearing a brighter red liptstick, or by editing in photoshop or something similar, would bring the lips out as well as the suggestion they give. To use a lipstick would work better with less cropping, to make it stand out against the skin, or it could be overpowering.
But it is a really good photo as it is <img src="e.deviantart.net/emoticons/s/s…" width="15" height="15" alt="" title=" (Smile)" />