As you may perhaps be expecting, it's a basic part of the publishing course of action: a book cannot be revealed if it does not have a book cover. Probably much more importantly, it generally will not manage to entice visitors if it doesn't have a very good book cover. https://whitemagicstudios.co.uk/blog/benefits-of-amazon-enhanced-brand-content-when-self-publish-on-amazon-uk/