Select “Make your contest private” from The competition possibilities area before you start your book cover design contest. This could prohibit designers from working with their designs elsewhere, and your contest are going to be un-searchable on the net. We selected a gas-mask-sporting chef to capture the book's strange spirit. https://whitemagicstudios.co.uk/blog/a-complete-guide-to-writing-self-publishing-a-book-on-amazon/