She might not have read many books. But when she reads a book, she swallows the very words. If you open the books on her shelves, you will find that the front and back covers encase white pages.
There are a lot of conventions, a vocabulary and a set of practices and assumptions that underlie most professional book design. Since design is important to the eventual success of your book whether you attempt to do it yourself or hire it out, it pays to know something about those conventions and assumptions. After all, we don’t want anything getting in the way of your communication with your readers. You’ve got a message for them, a story to tell, or ideas to spread. That’s what’s important.
Aspiring authors, get this through your head. Cover art serves one purpose, and one purpose only, to get potential customers interested long enough to pick up the book to read the back cover blurb. In the internet age that means the thumb nail image needs to be interesting enough to click on. That’s what covers are for.