I have noticed a lot of variation in the number of pages of story content in picture books (not counting copyright pages, etc). 24, 37, 26, 29, 24, 32, 36.
I am working through the book Writing Picture Books by Ann Whitford Paul. She suggests making a picture book dummy as part of the process of revising, and (among other things) to focus on pacing and page turns.
How should authors account for the variation in published book length when making dummies and planning page turns?