Usually I use a variety of colors, like a bit of orange, pink, yellow, brown, etc, on an undercoat of Charred Brown (I use Vallejo paints at the moment). When it's all done the base looks really out of place and waaaaay too colorful, which is when I use my Sepia Ink, which does a nice job of toning down the brightness/cartooniness and giving it a really nice look. I'll see if I can't get up some pics of my Belles to give you a better idea, or you can check out my The Hanged since I used the same tactic/technique there as well.
Of course, I"m also open to suggestions