Comments: I wanted a soft dreamy look for this teen photo but also a distinctive focal point of interest. I decided to emphasize only the right side of her face and to throw everything else out-of-focus.
First, by using a wide f4 aperture and moving in close I was able to reduce the depth of field (area of apparent sharp focus) - more depth of field discussion here. Then, by focusing precisely on her right eye, I was able to keep only that eye and her nose and mouth in focus, softening everything else for the contemplative pose I needed. This photo also shows why black is the most important color in a photograph. HC
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