The photo would have been better if it had been more candid. In other words, if the subjects had been involved in what they were doing, rather than looking directly at the camera.
Great picture. I usually don't like pictures with kids, but you've captured something more than a "Kid" shot. I also like the B&W conversion. Only thing I can say is the horizon is off. If you did that on purpose, please disregard.
The photo says Pose, Pose, Pose not Practice, Practice, Practice, as the subjects are looking directly at the camera. I like the sepia tone and the film grain feel to this image but if the image had a bit of motion blur it would have conveyed practice a bit more strongly.
man i haven't done judo in a long time. the image looks good, but you have a coulple of whites that are blown-out and distrating, and a little dark on the faces, but it looks good.
VERY NICE! Great shot for this challenge. My one suggestion would to either skew the horizon line so they are way off balance or level it out. Great job though!