Scale and Space

Scale is used to help define the size relationships between the elements of an image. A sense of scale goes a long way to adding to the feeling of space in a scene. In this beach scene, clearly a semi-abstract design, the inclusion of the single human figure walking across the sand allows you to immediately appreciate the amount of space included in the image. Without this point of reference it would be very difficult to perceive just how much of the beach had been used to form this design oriented image.
Q: Why is the water so blue?