This is one of my favorites in this challenge. The visual simplicity of neutral colors makes this an attractive image, and I think the concept of 'dance,' is more passionately and realistically portrayed here than in any of the other challenge images. Something about how the viewer cannot see the boy's face gives a sense that he is lost in expression of his emotions, giving this image a poignant honesty. Yes, the staged portraits of cute little girls in flowery ballet costumes will probably get the high scores - but it's images like these that encourage me to keep hunting for more of the good stuff - it is out here. :)
good use of the rule of a thirds. I am not quite sure what you are trying to do here though. I also think you were a little bit early on the shutter here a fraction of a second latter so his back is not facing the camera.