Here there are some storyboards to demonstrate the way they normally work. They tend to show key frames or frames where sometihng changes i.e. a new shot of something or an event in the timeline, for example in the second storyboard down, the western one, when the Cowboy is thrown out of the saloon, arrows suggest camera motion and there is a keyframe for every shot, i.e. a frame ot show the saloon door before anything happens, a frame to show the cowboy is thrown out of it and a frame to demonstrate a shot change to looking from behind the cowboy outward. It is important when I make my own storyboards to remember that I need only highlight these key changes rather than creating a ridiculously painstaking storyboard that highlights every little movement. This would defeat the point of a storyboard as Fred suggests, and I would be closer to making a stop frame than I would a story board sequence.
Often like in a few of the examples here, the storyboard is annotated, this can be with the motion the camera takes, for example if it pans out, without polluting the effect of the image with ridicuously elaborate drawings over the storyboard frame to elaborate on the way the camera works. Other elements such as relevant dialogue can be added underneath to give a greater idea of where the image comes in the sequence.