When wearing makeup enhance your most flattering feature. If your lips are your best feature, wear bright or strong lipstick colours.
Many women with melanin rich skin tend to have fuller lips. Accentuate your lips with a pencil liner that is as close as possible to the lipstick colour you are wearing. Alternatively you could use a lipstick brush dabbed on lipstick and line your lips that way. This works for me, I prefer softer lines. Many black women use darker lipstick liner, but I find the harshness of the colour could take away the beauty of full lips. I tend to avoid black pencil when lining my lips.