For me, you had the key light up too high. It looks like the shadow under her nose is just about touching her top lip, which, for me, is too much.
Also, the image just too soft for me. You know my style Phillip...I like soft portraits, but for some reason, the amount of softness on this one bugs my eyes.
I would like to see this model with a backdrop that is more complementary to her skin tone. White just doesn't do it for me with this model.