A big part of why thumbnails are so critical for me is that it forces me to recognize a bunch of stuff that I may not have thought about purely from writing the script.
Of note here is that... it's raining. It's /been/ raining since this page started. But now Trinity and Ms Shepard are going out into the rain. This forced me to consider a holo-design for an umbrella Trinity might use.
Also, hey Simon. These thumbnails are incredible for reminding me to include certain details in pages; I might not think to have included debris without having done this exercise.