I really like this image, but it doesn't meet the challenge .. in that it is high key. But you are making some really good moves in developing your skills as a photographer .. and should keep it up ... I can't wait to see how you develop further.
the picture definitely has some emotional load, which is great. but you have no idea about lighting! whatever you've done to yourself is brutal! you could have the face look much more tri-dimentional and still preserve your preciouls catchlights.
Please remember that when you submit a picture, you may use up to 640 pixels on each side. You will get a lot more impact from your image with the proper size.
Secondarily, this image is more high key than low.