The two photos below are of the same subject. The first photo was taken by an amateur photographer, making rookie mistakes. He decided to use a vertical layout to capture the pool, but this chopped off the near corners. He does not include the sky or a visible horizon, and the background is an uninteresting wall of green. The center of the photo falls in the water, with no interesting details.

Below is the same subject photographed by a professional photographer. Notice how the landscape orientation she has chosen complements the vertical layout of the pool. By moving to the other end of the pool she includes sky and an implied horizon. Notice also how she has placed the vanishing point at the splash of color inside the pool shed to act as a focus point. Simply by changing the focus point, orientation, and camera location the subject is made to sparkle!