Authors: keep your ego off your book covers until you are famous
you are known for writing, conning people out of billions or winning Olympic
medals, keep your name and portrait a lot smaller than the book’s title.
Later on, if you become
famous, you can revise the covers of your earlier books. More about book covers, The Look of a Book: what makes a book cover good or bad and how to design a good one: http://www.amazon.com/dp/B00BAPV724