Lighting, color, exposure, saturation, hue, and contrast are all very well done.
Focus is excellent. Depth of field is good, though the lips start to go soft just a little bit early for me. Or maybe a little too late. The sharpness of the lips at the edge of the mouth on the left draws the eye right out of the frame. Either that, or move the model to the right so there is a little space between the lips and the edge.
The skin tones are great, as well as the rest of the compostion.
Overall, this is a very good picture and I could see it hanging in a gallery.
Personally, I do not like the way this makes the bottom lip look. Regarding the actual quality of the shot, the colors, composition, and focus are so great and I love the shimmery lipstick/gloss.