I love the images she came up with for Split -- how the fist is foregrounded and the background is blurry, left to your imagination. The kid in the tennis shoes taking off... lovely, given the fact that the book features running, both metaphorically and literally.
I'm absolutely thrilled with it and I'm considering asking her to do one for Split, now that I've seen her work. But I have to wonder about trailers in general. What do you think? Do book trailers make a difference for you? Has one ever helped you decide to buy a book?