I've found Pressbooks are actually easier on the eye: because with the slightly
larger page dimension, the type is slightly less cramped than in a typical trade paperback.
Since books with smaller page dimensions can hold less text on each page than books with
larger page dimensions, the smaller version of a given book will have more total pages than the larger version of that same book.
Not exact matches
Start by thinking about how
large or small you want your image will appear on the
page, and calculate the
dimensions accordingly.
There's usually no one standard size these images need to be, as you can set them to the left, center, or right of your
page and include different
dimensions as needed, but it's best to make them
large enough for blog visitors to read without detracting from your content.