How to Design a Facebook Ad

We use four different ads within an ad set on facebook, so that each one is served. The the one without any frame, without anything, is always the most successful. I think having all those different options of ads within the sam ca, same campaign means that maybe someone won't click on just the picture,. cause it's just a pretty picture. But maybe then thy'll see it later with the book or with the series of books, and they'll realize what it is... And that works really well for us. i know other authors hove done similar things.