In taking a picture, light is key. In a studio you can manufacture exactly the light you need when you want it, but outside it's not that easy. Nature has a way of doing whatever it wants, but it is often fickle. Most of the time all you have to do to get different lighting is wait. Patience. Ugh. Yep, that.
In this picture, the clouds had my subject completely in shadow,
and then the sun finally got through. Different times of day will give a whole array of color changes on a subject as well. Think of Monet's studies of the Rouen Cathedral. For this photo shoot, I didn't subject those with me to that kind of patience.
Application to writing? When describing something outside, remember how the lighting will change the colors or create patterns. e.g. The clouds wove lace shadows over the grass...