Principles of Design

 Movement

 Variety

 Unity

 Emphasis

 Balance

 Repetition

Pattern 

Rhythm

My favorite photo is the Repetition photo of the ukelele, because the angle it was taken at and the starting point at the headstock makes it very cool. It also displays it's principle well because of the repetition of the leading lines which brings the focus to an intersection of the Rule of Thirds grid.