The artist on volume 3 of The Story of Lee, Piarelle, tells us a little about how she works (p1 of 3):
“Before working on the Story of Lee volume 3, I needed to get a sense of the story and the characters, so I decided to read the first two volumes. The first two volumes were worked on by two different artists, so the visual styles were quite distinctive from one other. To me, the story itself made me think of ‘josei’ manga as it had a mature, realistic feel to it so I thought to take that approach on the third volume.
There is a process I went through in creating each page for the Story of Lee, volume 3.
First I’d start with thumbnailing the page layouts. Sean pretty much wrote on the script what he’d like in each panel, so I worked with that. I’d read the script, get a sense of the atmosphere in the scene and compose little page layouts on scrap paper. I like to plan pages in a way that enhances the story’s flow, so I usually plan where the speech bubbles should go at the same time I plan from what viewpoint to draw the images. I try to make both the words and pictures work in harmony together.”

Check the book on more on the publishers page HERE
Or Sean’s WEBSITE