Good article over on the curiously named ‘Waondering’ (ah! I get it ‘wandering and wondering’!) blog about how directors break down a script visually for shooting. It’s just a brief introduction, but it gives some examples and can get you started on this fascinating and useful practice! This, combined with the trend to do animatics, might help you flesh out not only your visuals, but also your story.
It’s a lot cheaper to experiment on paper than on set!