I also use a sheet of photo paper face down...lately I've made 8x10 and 11x14 templates in Photoshop with gridlines and bold outlines of various sizes/crops to compose my images on. After composing and setting the easel blades, I replace the template with the photo paper sample to focus. The grid helps make the borders a lot more even than using the numbers on the easel, which always seem to be slightly off even on the more expensive ones.