Did he take the photo himself, too?
You say, "It's not the world's greatest photograph," but remember that there is something special about kids as photographers because they don't have any preconceptions about what a photograph "should" be.
Looking at kids' photography can be really great if you just forget your own preconceptions and look at it through their eyes.
Don't worry. They'll learn their own preconceptions soon enough but, for now, just enjoy.