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One of the composition rules that is useful is background because it focuses in the subject but you have to compose your shot so that the subject doesn't get distracted.
http://www.digitalcameraworld.com/2012/04/12/10-rules-of-photo-composition-and-why-they-work/
http://dailypost.wordpress.com/2013/07/30/composition/
http://photofocus.com/2009/11/30/25-photo-composition-tips/
http://www.ephotozine.com/article/12-top-photography-composition-rules-17158
http://dailypost.wordpress.com/2013/07/30/composition/
http://photofocus.com/2009/11/30/25-photo-composition-tips/
http://www.ephotozine.com/article/12-top-photography-composition-rules-17158