Read the following article on the technique of Framing your Shot:
http://digital-photography-school.com/framing-your-shots-photography-composition-technique
Here are some more examples:
http://digitalphotobuzz.com/framing-the-shot
Framing
Professional shot composition requires perfect framing of each shot. This requires the inclusion of elements that give perspective to the main focus of the photograph. By being aware of the various components when composing a shot, the photographer can produce high-quality shots that include all the important elements while excluding extraneous material. Photography is the art of including some things while omitting others; this is the main object of framing. By choosing the elements to include, photographers engage in editing before the shot; by cropping the photograph after processing, the editing process continues afterward as well. Not only can you frame with your lense, you can also use objects in nature to frame.
Take at least three photos from this Framing assignment and upload to Flicker. Your set name should be 'YourName - Framing'.
Let me know if you have questions.