In my mind's eye, I visualize how a particular... sight and feeling will appear on a print. If it excites me, there is a good chance it will make a good photograph. It is an intuitive sense, an ability that comes from a lot of practice.
There are just certain things that turn my head. It may be a girl's sense of humor, it may be her wit, or her belief system; it could be a lot of different things.
I'm one of those writers who, when writing, believes she's god-and that she hasn't bestowed free will on any of her characters. In that sense there are no surprises in any of my books.
Short-story writing requires an exquisite sense of balance. Novelists, frankly, can get away with more. A novel can have a dull spot or two, because the reader has made a different commitment.