Cute frog! I had one too. She would draw up knees and elbows in such cute rhythm and we'd say, "dance, Kermit dance". I love that lanky stage of youth.
Very well done study of your son. The composition is very effective, in that although he is looking out of the frame, I found my view immediately drawn to him. Add the fact that you have great tones in the water and the shrubbery, and it seems you have covered all the bases.