Wonderfully clear and well exposed photo. I like having all three faces in the staggered positioning, and you captured those cute faces perfectly. Technically, I don't think there is anything that needs improvement.
I'm not sure I would give this many points for relationship to the challenge. Meeting the challenge theme is such a subjective thing, though. It does seem to be the opposite of what the challenge topic suggests.
The only other thing I can add is that my first impression of the photo was "Oh, how cute", but then the more I looked at the photo, the less it held my interest. I'm not quite sure why that is. I think perhaps because of the lack of any interesting color maybe a straight b/w treatment would be better? Also, I probably would have tried to see what simply more of a close up on one of the faces might be like. Perhaps a bit more impact?
All in all, just as it is, I like the photo very much.