In my opinion a significant problem with the photos - and especially evident in the color version - is the blown highlights. Seems like an odd thing to say but if you look at portions of her right cheek, nose, and shirt there are lots of blown highlight areas.
If you have Photoshop CS3 you can fix the blown highlights by opening the photo in Adobe Camera RAW and lowering the exposure by 1 stop, increasing the Recovery slider to bring back detail in the blown area (especially the skin), and increasing Fill Light to open up the shadow areas.
I would also work on toning down the blown highlights in the background since they draw attention away from the girl's face.
Also, one of the reasons the colors appear off is that the photo was posted with the Adobe RGB color profile embedded. When posting to the Web your photos should be converted to sRGB.