Good focus and clearly meets the challenge. Overall, this has a snapshot feel to it. The capture of the moment before the blowing out of the candles is good.
nice idea, and if indeed this was a real birthday, then i hope it was a happy one. in terms of the image itself, the skin tone seems wrong and perhaps a different lighting approach would have yielded a more effective image. it feel that with more contrast and a different color cast, this image would be rating quite high.