Hey Matt
I hope you don't mind, but I've ninjad your photo to play around with it. I thought I'd show you a slightly different approach. If you don't want me to do this again, please say so and I won't.
A new layer of black in the same shape of her face was thrown over the top, blended and opacity changed appropriately to give a softer looking light over her face. She has really nice skin but some of the areas seem a little more 'bumpy', so I've tried to smooth out those areas a little bit so it isn't as prominent. There is a little bit of this whiteish colour above her right eye, I've tried to dull those white lines a bit. Her eyes have also been sharpened.
I was assuming you were going for the model kind of look - so I played around with that in mind. Honestly, I've done hardly anything as it was pretty awesome to begin with.
Again, hope I haven't upset you by playing around with your photo. Please let me know if you don't want me to do that again.