There's a saying among photographers that "moment is everything." This means that good lighting or composition doesn't mean as much as capturing the moment that should be captured. David duChemin countered that argument in his podcast by reminding everyone that the composition of that "moment" can make or break the image.
I recently took two photos of my four year old on his scooter. In my eyes, one image is more compelling and powerful than the other. Let's see why.