High quality photographs over a two-page spread is more visually arresting. I really like the pages where the frame of the photograph is the boundary of the magazine itself. However, careful consideration of borders gives the image more emphasis. Pages with only 1-2 photographs are more effective than the ones with multiple photographs. Symmetry isn't as appealing.
The photo here was created with a double exposure, and I like the way the creator blended the two photos together. The first layer of the photo has the the animal, and parts of them were erased and blended together with the second photo.