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Apparently for skin, what we see is due to mainly subsurface scattering. Only 5-7% of the incident light is directly reflected back to the environment with the rest being scattered inside the layers of the skin. (A Biophysically-Based Spectral Model of Light Interaction with Human Skin by Aravind Krishnaswamy and Gladimir V.G. Baranoski)

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Wondering if this is how beauty camera works? Applying some fake light to the original photo?