I plan less and less. It's a great benefit of writing lots, that you get good at holding long narratives in your head like a virtual space.
Jonathan LethemThe less you offer, the more readers are forced to bring the world to life with their own visual imaginings. I personally hate an illustration of a character on a jacket of a book. I never want to have someone show me what the character really looks like - or what some artist has decided the character really looks like - because it always looks wrong to me. I realize that I prefer to kind of meet the text halfway and offer a lot of visual collaborations from my own imaginative response to the sentences.
Jonathan Lethem