The book cover should be 782px by 1250 px.
The picture on the book cover should give some indication of writing, such as a pencil, books, typewriter, etc.
The title and author should be in all CAPS using a wide font.
The title should be at the top of the page centered.
The author name should be at the bottom of the page in slightly smaller font, centered.
Avoid a stark, white background.