Critique: Kasey in the Mirror

I like this picture, of course I love any photo of Kasey, but there is definitely room for improvement. The composition isn't ideal. There is too much uninteresting space on the right. The reason this happened was that I set the AF point to the center and was so concerned with getting her reflection in focus, that I forgot to recompose. I think adhering to the rule of thirds would have helped. The picture is too dark. I didn't have my flash attached otherwise I would have tried bouncing the light off the ceiling. But I'm not a big fan of non-directional flash, so I'm happy I didn't introduce artificial light. My ISO was already pushed to 800, but I could have increased the exposure time to 1/100 or even 1/50 and that may have helped. Of course I could have cropped and increased the brightness of the dark areas using Lightroom, but until my carpal tunnel goes away, I'm doing as little post-processing as possible. Photo info: 52.5mm focal length, 1/200 sec, f/2.2, ISO 800