Shading. Once again, starting with the skin, choose a tone that is slightly darker than your base color. Use a solid brush to start out with to block off your shaded areas, then choosing a tone between your base color and your shadow color, switch to a softer brush and feather the line between the shadow and the base. This will give a nice soft smooth effect. Repeat for all layers.
For the blush, make a new layer and set it to multiply, take a light pink and a soft brush and gently apply, you don't ever want to over do it with makeup.