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it does i know, because it is a compressed jpg edited in 3 min :)
in bw images i as i viewer don't know are walls yellow or blue, or are shelves white or black, so your skin could be brighter than surroundings. when you have a color image you could move yellow/orange color just a bit to brighter side to get skin color a bit brighter and it would not look unnatural. My take on it :D not meaning that i am right.

I agree with @eveuncovered more. It must be something to do with the thing that once you go dark you'll never go back. :D Yes I think I got it right, that's the saying.