Photo Tip #28-Three Things Make a Great Photograph: light, light, and light
Don’t forget that photography is all about light. Learn where your light source is, where it is moving (from which direction to which direction,) what is in the light, and what is in shadow before setting up your shot and pay careful attention to how light is changing as you shoot.
I’m always surprised when I meet photographers who do not know when sunup, sundown, or moonrise is, as well as a little bit about the seasons (when the longest day of the year is, for example) because these things have a huge impact on the look of our images. If you work mostly in studio, you still need to learn to work your lighting gear for maximum impact.