It's quite deceptive to use that image from Annie Leibovitz as an example. The rule of thirds squarely points to nothing in the image, and for a very good reason. If I remember correctly, that image was used as the cover of the magazine, and judging by the proportions of the image, it was folded twice to make the standard issue cover. Therefore It needed to serve both as a 1/3 of an image, 2/3 of an image and the entire panorama. Meaning if anything important were to be placed on the rule of thirds, they would have been cut off on the fold line. While it does go to demonstrate other compositional measures, I feel an image without a physical need for other compositional tools would have been a better example.