Compare these two images, both of the same swarm of mating ants:
What's the difference?
The lighting, of course. In the first image I stood facing the rising sun so that the insects' translucent wings glowed, while in the second I moved to shoot the swarm from another angle, the sun hitting them from the side. A much plainer result, to my eye.
Managing light is the most important aspect of photographic composition. Entire books (as well as some fantastic blogs) have been written on the subject. I can't compete with that level of detail in a short blog post, so let me instead distill the…