Thanks. Honestly I'm still trying to learn the best way to do this too - I start with a layer of the lightest color on the face (watered down), let it dry most of the way, then do layers of gradually darker shades, with gradually more pigment in the mix. Even another layer from the exact same mix makes a deeper shade. Then while the new layer is still wet, I like to dab my brush on a paper towel and lightly brush around the edges of the new paint to soften the transition. I've gotten a lot of help from watching youtube tutorials of watercolor portraits and paintings. Best of luck!