You might notice your fingers turning pink in the cold, or your nose, just before an awkward sniffle. This is blood rushing to your extremities to keep you from getting too cold. It's most noticeable on fair skin, but can be seen on all skin types. Other places we might see this color change are cheeks, ears, elbows, knees, toes, etc.
When you paint skin, try shifting the hue a little in these areas.