Okay, here is a picture of me with bare lips for reference.
MAC's Faux lipstick is almost identical to my natural lip color, and it is described as a mauve-pink, so I suppose that is what my natural lip color would be called.
Here is a picture of me with Faux on my top lip and nothing on my bottom lip.
And here is a picture of Faux on both lips. It doesn't really change my lip color at all, but it does make them look more full and pouty.
MAC Faux, Satin, NC/NW 15-20, mauve-pink lip pigmentation, no liner