Hey, stankygrrl! :) If you don't find something that suits all your needs, I would like to suggest that you search for character packages that at least have the type of skin tone / texture you're looking for. You can then morph the character however you please. : )

Now, you mentioned Beyonce. Lolo for V4 's skin tone comes to mind. This character has a beautiful, golden brown texture, especially in the last promo image; if you like the skin, but prefer different facial or body features, you could still use [something like] this and simply use the morphs you wish.

Sometimes we can't get all we need in one product; that's when it's time to mix & match! :p
Hope this helps!