Contrast, 2013. The contrast of the blue and green makes the colors pop.
Balance, 2013. The picture consists of mostly blue and creates a well balanced color scheme.
Emphasis, 2013. The different temperatures of the colors emphasizes the red of the shoe.
Unity, 2013. The picture really comes together as a whole.
Movement, 2013. The people in the picture are captured in focus while walking.
Pattern, 2013. The lines in the picture are pretty consistent which make a pattern.
Artist choice, Contrast and Emphasis, 2013. The colors contrast and emphasize the sun.
Artists choice, Balance and Unity, 2013. The water reflects the plants and creates and sense of balance as well as unity.
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Principles Of Designs

Contrast
Balance
Emphasis
Unity
Movement
Pattern/Repetition