Elements and Principal: Photography

Radial

Courtesy : http://www.fineartphotoblog.com/nature/radially

 Rule of Thirds

Courtesy: http://photo.net/nikon-camera-forum/00CkD5

Symmetrical

Courtesy: http://www.tecbird.com/2012/02/inspiring-symmetrical-photography/

Asymmetrical

Courtesy: http://www.lussierphoto.com/2010/02/15/asymmetrical/