This is why they're called "thumbnails."

 Thumbnail comic layouts by Chris Moujaes.

Thumbnail comic layouts by Chris Moujaes.

This is a glimpse of my old process when I first started working on webcomics in the early 2000's. It was all done in pencil, and I used to draw little sketches called "thumbnails" to plan out the story. It was easy for me to cut and move them around if necessary while editing the story flow.

Nowadays, I do all this digitally.