What should I ask Andrew Graham-Dixon?

He is one of the world’s leading art critics, all of his books are excellent, and he has a new and very good work coming out titled Vermeer: A Life Lost and Found.  He also has a well-known book on Caravaggio, on Michelangelo, and I am especially fond of his book on British art.

Here is his Wikipedia page.  Here is his home page.  So what should I ask him?