Given that the whole scene is blueish, I expect to see cool shadows, while yours are hot? If you go for brightness, give me a harsh contrast of warm light and cool shadow! However, in your lightning, with light directly above the camera, it will be hard to achieve what you want, without getting that flat flash look, where all you get is washed out light without attractive shadows. As it is now, creating darks through her hair is not going to work, as the hair will be as brightly lit as the face.
You may want to reconsider the value design, for instance try a darker background?
This is what I would go for, to pump up the brightness.
Double check her eyes: they seem to be different.
Grinnikend door het leven...