if being a kid, as I believe, means incessant joy, license to dare, expressions without thinking, well, you've brilliantly captured the essence of it. I find this image specially beautiful for it shows attitude, so typical of that age. And, for sure, for its "decisive moment" timing, tones and contrast, which enrich the image, and for the movement. Congratulations, really. An amazing image that stays away from the "standard" and that makes it so special.
Regards from Brazil,
Jose Azevedo
A small technical doubt - wasn't it 3 seconds instead of 30?