Balance -that all of the subjects in the photo are either symmetrical or asymmetrical. 


Contrast- difference between highest luminance and lowest.


Emphasis- Emphasis is a principle of art which occurs any time an element of a piece is given dominance by the artist  


Movement- The way that your eye is directed across the photograph, how one element of the photograph leads our eyes to another. It also refers to whether action is captured, or what pace is portrayed.


Pattern-Patterns, both natural and man-made, bring a sense of visual rhythm and harmony to photographs that, like a series of repeating notes in a melody, capture the imagination. Patterns appear whenever strong graphic elements—lines, colors, shapes, or forms—repeat themselves.

Rhythm- Rhythm is the repetition or alternation of elements, often with defined intervals between them.
Rhythm can create a sense of movement, and can establish pattern and texture.

Unity-

A principle of art, unity occurs when all of the elements of a piece combine to make a balanced, harmonious, complete whole.