I have deep brown skin and finding a nude, flesh tone lipstick for everyday wear is sometimes challenging. When wearing a nude lip, my goal is to always look natural but polished. The secret to a perfect nude lipstick for brown skin is:
1.) Deep brown lip liner. I prefer Chestnut lip liner by MAC because it is deep enough to add depth to any lipstick but smooth enough to blend.
2.) Peach. I tend to stick to lipsticks that have a peach under tone as to not make my lips ashy.
3.) Matte. I stay away from lusters, glitters, and too much sheen when I'm going for a retro nude lip. It looks less messy and more polished if you stay away from the glitters.