As we try to produce more compelling and attractive images, it is important to consider some design principles. One technique that can make your pictures more pleasing is framing your subject. Framing your subject helps to isolate and highlight the most important part of your image. The result is the same as framing a painting or a printed picture - when you hang it on the wall the frame showcases what it's containing.
Sometimes frames within an image are obvious (like in the picture above,) but they don't necessarily have to be so straightforward. Any lines that cut across you image and create a border for your subject can serve as a frame.
