I like this picture very much. As I am still learning, I look forward to your comments telling how you got such a crisp image with what appears to be only candle light.
The difference in color between the light of the flame on the candle and the light on the face is bothering me a bit, and I'm not sure about the position of the light in relation to the face. Maybe a different composition with the light in front of the face (so the flame overlaps the face) might have been stronger?
Great composition. The expression on your model is great and the use of candle light. Having half the face visible and illuminated and half dark and invisible is a great idea. Lighting is very good though it does have a little of the typical yellow hue common in low-light level images. One of the better images in the challenge.