I think your skintone is dark enough that you could definitely pull off a brown, perhaps even darker than the pictures you are posting! I think it will warm up your skintone and add a little more contrast! (Right now it looks like your hair color is pretty similar to your skin color, so there's not much contrast. I personally prefer a little more contrast between hair and skin color, at least for most people!)
I like the Cosmo picture in your first post ... I think you would look great in a warm brown, or a brown with golden highlights! The first and last pictures in your most recent pictures post are also nice shades of brown!
By the way, what color is your natural hair color? That will give us a clue as to what hair colors will look best (or at least most natural) with your skintone...