I love the smile in this! It's very genuine, very warm. I think it meets the challenge, but I think the technicals hurt your score - on my monitor it's very grainy. And for DPC, it's probably not nearly "set up" enough. :-)
Hmmm. I personally might not have cropped so much of the subject's head off, but that's just me. also, the light is a little harsh, one can see sharp shadows created by the flash. Otherwise I think this is pretty good. :)