Looking down into Panamint Valley, a partially cloudy skies make all the difference in a photograph. I’ve taken this shot several times, but with flat, uniform light, and it has always resulted in a boring image.

Looking down from a high point, a large, barren valley runs left and rihght. 
 Light hits the bottom of the valley, while the foreground is mostly dark.  Patches of light hit the rugged, eroded mountains on the far side of the valley. Clouds fill the sky, but not uniformly, there are many different types, and patches of blue show through.