Photography is defined as on the Photography page of Wikipedia as
"Photography is the art, application and practice of creating durable images by recording light or other electromagnetic radiation."
We'll ignore the last bit - the radiation bit.
Creating images by recording light.
So study the light.
Study how the light interacts on the elements within a composition. I do this before I take an image – see what the light is and see if I can find an angle where the light makes the composition more interesting.