Here is an example of a storyboard for short film that I did a few key illustrations for. Though I'm not usually given direction to this extent, the Director of the film was able to give me a good description for a few frames.
This is one of them:
"Fred, naked, paddles the shitty boat with his shackles still on. as the two hicks chase him. One has a shotgun pointed at the boat, the other points wildly at Fred with a Catfish hanging from his hand. A frantic scene.
Frame: Fred in a medium shot to the right of the frame, paddling on murky waters. On the left of frame, in the distant background: the hick with the shotgun. The other hick is a few feet further up. A row of dead catfish is in the middle of the frame in the background, with a dog barking beneath it.
Colors: Earthy. deep greens for the bushes on the edges of the frame, brown water, some sky (grey-blue)