This is a nice shot with potential to be excellent. I would like to be able to see what it is the boy is doing in order to really connect with him (since we can't see his face, his actions are all we have to draw us in). The subject and his surroundings are nicely framed and there is a good amount of detail and in the foliage and bark. The boy's shirt has some nice texture and the color harmonizes well with the otherwise monochromatic scheme. This is where I come back to wishing you had waited to get a shot showing more of the action. There is just enough red showing on that fishing net that I wish you had arranged it so a little more showed to add more striking contrast. I don't really see how it meets the criteria for serendipity, however.
I like this photo - it tells a nice story about the kid. I like that his back is to us, it makes it more universal. I think the contrast could be bumped up a bit, but the composition is nice with the tree and the child dividing the frame.
There is such a genuine innocence here. A kid, water and not a care in the world.
Brightness & Saturation are both a little down for my liking, but then again the attention should be the boy, not the foliage. Good DOF.
Well Done!