The great thing about style and fashion is it's a matter of preference. There are no wrong answers. With darker skin tones you can pick a shade that is similar to the skin which will offer a slight contrast and that could be appealing. You could go darker for a bolder look. You could also go to the other end of the spectrum with something very bright and light to have a high level of contrast. It's really about the persons personality as much as aesthetics and what they enjoy and feel like they can pull off.