C&C per req:
1. LIGHT, lots more light!!! You've got a bright background and a darker-skinned person. This is causing your camera to give you incorrect information. Instead of using Matrix Metering, in a case like this, use spot metering on the face; that will give you a better starting point.
Ideally, you would use a reflector low and camera right to provide fill light, or even an off-camera speedlight. Notice how her eyes are very dark, and almost lifeless? You want visible detail and ideally a catchlight to give them some sparkle.
The image is also a bit tight; either crop it to a bust composition (Head, neck top of shoulders only) or open it up so that her arms aren't laterally bisected. Also, watch your backgrounds; this one is out of focus, but still has enough detail to take away from the subject.
2. Better lighting here; a fill to bring out some detail in the hair wouldn't hurt. Same comments as per #1 regarding the crop. Better background, but lose the sunglasses!
Just my $00.02 worth - your mileage may vary.
~John