When we were designing the cover of my speculative spiritual thriller, THE GRAIL CONSPIRACIES, a montage of Da Vinci's classic drawing, termed the "Vitruvian Man" on "The Eye of God," the NASA photo taken by the Hubble Space Telescope seemed a natural.
God + Da Vinci teaming up on your cover? Of course! Go for it!
What triggered this blog was my happening on the review of a new book: DA VINCI'S GHOST: Genius, Obsession, and How Leonardo Created the World in His Own Image.
I only came on the review today, so haven't gotten to the book itself, but it sounds fascinating.
You'll find Don Oldenburg's review in USA Today.
The book, in both print and Kindle versions, is available at Amazon and other sellers . . . ESPECIALLY your local bookshop (which needs your business a lot more than does Amazon).