Tenebris // Though this picture is simple. I have done black and white photography for many years and my favorite element of design is contrast. The contrast in this photo takes it from simple to interesting.
Symmetrical self-portraits - great idea for teaching symmetry and measurement. Excellent step-by-step instructions.
The arrangement of the rocks let them balance on one another. The photographer uses depth of field, texture, and is taken at worms eye view.
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Leading lines can be used in a subtler way, to emphasis perspective, for example.