Scale of the Scene and position the camera to include a subject in the scene allows a viewer to relate the size of your composition. In doing so, your image pops and is much more interesting.
Example
File:Wolf.pngI wanted to concentrate over the attacking wolf and my mage preparing for the fight. If I made the frame bigger capturing part of the environment on both sides (or on the right/left only), the final result would have become a bit dispersive (and distorted due to the camera tilt I applied).
