Principle of Design

                  Left Portion is asymmetrical                                          Right portion is Symmetrical

http://www.digitalmediaacademy.org/tag/3d-modeling-and-animation/

Radial

http://etc.usf.edu/clipart/6900/6910/radial_6910.htm

 Rule of Thirds

http://photographiclizard.blogspot.com/2011/02/rule-of-thirds.html