A good result checking technique, is to animate the steps "BEFORE AND AFTER".
For those who work restoring photographs, it is possible to check the contours, thus allowing to the editor, working safely within the boundaries of the strokes, since sometimes the changes of light and shadow can create the illusion that the work has changed the features.
A more intense shadow in a face, can make you appear slimmer, although the original photo's contours have been kept..
The "Animation BEFORE - AFTER" may bring out a strong argument at the time of your explanation.
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Uma boa técnica de verificação de resultado é animar as etapas "ANTES/ DEPOIS".
