Our friends at Bobbi Brown Cosmetics
helped us out with this question.
"Nothing makes a woman look prettier than a pop of blush. While choosing
the right shade of blush seems to be difficult for many women, getting
the right one is surprisingly simple. Your perfect blush shade is the color of your cheek when you are flushed or exercising. Since I like blush to look natural, I prefer shades that are rose-toned, pink-toned or tawny brown. It follows that the lighter your skin is, the lighter your blush shade should be. After you have found your natural blush color, add a pop of a brighter color just on the apple of your cheeks for an instant lift."