Washing comes before drybrushing. Take a shade darker than your base color and dilute it until it's about the consistency of milk. Now, brush it across, gently. It'll flow into folds and crevasses. Makes cloth look real good. Remember, you can always add wash, so start light and work your way up. Don't be afraid to wash, then darken and wash again, until you've reached the effect you like. Wash yellows with yellow-orange or yellow-brown, flesh with light brown, white with bluish-white or gray. Experiment, only you can set your style.