From book designer Joel Friedlander:
People often ask me, “How can you tell if a book has been designed by an amateur? I mean, it’s just a book, right?”
This reminds me of the author whose book I was designing a few years ago, who asked me, “Book design? What’s there to design? You just put the page numbers on, right?”
Well… no, actually.
. . . .
I’ve gathered together what seem to me to be the 5 most common layout mistakes that authors make when they start to design their own books.
These are the screw-ups that I see most often in self-published books. Just be eliminating these errors, your book will start to stand out from the tidal wave of indie books being published every day.
. . . .
2. Rampant running heads
Unfortunately all too common, it looks like the author couldn’t figure out how to have running heads on some pages and not others. Or, they thought every page should have one, but display pages, like this chapter opening page, don’t need and shouldn’t have, a running head.
Link to the rest at The Book Designer