Rule for Details: Details must be preserved in highlights and Shadows areas in a photo.
Rule for "good histogram" see: http://www.dpreview.com/learn/?/key=histogram
Rule for dynamic range: "One must avoid loss of dynamic range in a photo"
Rule for "Avoid clipping" Highlight and Shadows should not be "clipped" This is detectable from the histogram when one sees a peak at the Left "0" or Right "255" edges
Why it works: The extreme contrast (check histogram) in the photo, gives it a very pleasing look. There are no details in the shadows and highlights, resulting in the faint translucence of the flowers against the stark white background and black branches giving an unnatural look further enhances by the toning.
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