At first, this doesn't scream childhood, however I do remember trying to catch flies in the house. Later in the fall when it got cold and they got slow. This is a good photo. i am curious to find out what the white lines are near the flies butt toward the bottom left of the photo. You can see it even through the flies wing. I like the colors that show up on his wings. Kind of metallic looking. Great photo and good luck in the challenge.
Lighting for the shot is very good and you've centered the subject well. Your title indicates to me that you were trying to convey an idea but struggled with the setting. I don't know how you could have conveyed the idea without actually having a child in the picture (which was not permitted), so if i had any advice for you, it would be- if you can't make the shot tell the story, shoot something else. I have had to let go a number of ideas because I couldn't think of a way to make it work. Being here on dpc, I have seen people who have more technical and artistic ability than I do and DID come up with a way to tell a whole story in a shot. One picture still fresh in my mind is the person that took the pencil shot that showed a bunch of stubby pencils coming out of dirt and above them the "picture" of what the pencils should have looked like. Others tried to do similar shots, but in my mind this one person told a whole story in the picture alone.