Frame your photograph, not only with a real frame, but frame it as you take the photograph as well. This scene taken at Tybee Island in Georgia illustrates the point. I used a small sitting area, along a walkway to the beach, to frame the lone walker on the beach.
This not only added depth to the scene, it provided more contrast and made the walker to be very alone on the beach on a chilly, windy, cloudy day. Of course, the walker was not alone. There were other people nearby but they were hidden by the sand dunes.
Here is the same photograph in color,but I feel it does not have the impact of the back and white version.