Designing Your Book Cover
Book covers have cover designs to catch a potential reader's eye. Draw them in and get them interested in what you have to say.
Most importantly you want to include the title of the book and, of course, the author's name on the front cover so it can be identified from advertisements and other promotions people may have heard about. Beyond that, you shouldn't want to put much more text on the cover other than the publisher's logo or it will end up cluttered. There are of course exceptions to this rule—just make sure it's more of a background thing and that the title and author's name are still clearly visible and isn't confusing.
The spine should have the title as well as the author's name (sometimes shortened to their first initial and last name depending on how much room you have). This is important because after it has been in publication for awhile or has reached a library it will likely sit on a shelf with the spine facing out rather than the cover of your book.
If the book has won any awards or garnered any praise you will want to mention 1 - 3 of the most important ones on the bottom of the back cover.
Be sure and take into account where the publisher's brand will go as well as bar codes and ISBN numbers as they will take some space.
You want your cover to reflect your book's theme, story, etc. Some books have very plain covers which makes them seem very serious, others have beautiful illustrations which reference scenes in the story in some way and gives it a kind of very fictitious vibe, some have a picture of a real life place indicating the story takes place near or at the cover's location at some point.
The possibilities are endless and it's ultimately up to you how you want to design your book cover. If you're having trouble coming up with ideas, just go to your local library, book store, or even an online book store and research what book covers look like.
Be it illustration or photograph make sure that the image is a larger resolution than your book so it can be cropped where it doesn't fit, sized down to fit correctly on the cover or both.