Sort by change date
Sorting by the modification date may be useful if you “pick up” all the images, i. edited in the order in which they should appear in the book.
Often one actually performs a check and adjusts the tonal values, exposure, section, saturation, etc.
If you open each image individually in the image processing program in the desired order and then save the images, a sort by change date will fit
If one collects all pictures with e.g. Adobe Lightroom in a collection folder, edit it, sort it as you like, and then save it in this Reiehenfoolge, sorting by change date would also be possible. In Lightroom, but you can also assign a new file name when saving, which makes my more SInn, because you can then sort numerically / alphabetically and images can also edit later, without changing the sort order