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Agree - very cute. I like the low angle you chose for your camera.
To give shots like this more impact, use one of the basics of photography - "Fill the frame" - with the subject that is.
Next time you take shots like this, make the boy and wagon much larger in the frame. Also pull back as you did in this shot and then compare the two. You may like one or the other or even both. (You may have done this already and chose this shot)