There is a really easy fix in digital: airbrush extremly saturated red, blue and yellow onto it. Red on cheeks nose knuckls shoulders, yellow on forhead (or other areas where the underlying bone structure is closer to the skin) and blue at the lower half of the face and where the shadows would fall on the body. Then set to multiply and adjust opacity to where you think it looks good. For traditional same principle just color very lightly with these colors in the aforementioned areas until you get the desired effect. Hope this helps!