I did not invent this technique. It has been used for centuries and by artists too numerous to mention. You may use it for any type of painting you wish to produce and in any color or colors.
1. You need to have one. 2. Board could be paper, illo board or canvas. Tape and/or gesso as needed. 3. Transfer (graphite paper, carbon paper, lightbox, projector, redraw) drawing onto surface. 4. Do this if you like your line work preserved/apparent. 5. A glaze means it uses medium - in this case gloss medium. A wash means it uses water. Choose any color but use a transparent paint (not only prussian blue - that we love). If you mix pigment plus gesso, you will be making an opaque which will obliterate your image. If you mix medium with gesso, you will be creating a translucent. Keep this fully in mind. Let layers dry between applications. 6. Lights: Use gesso because it is so opaque, or use a full bodied light valued pigment. 7. 2nd glaze: This is an all over glaze that pushes the value down. Begin to "see" pattern of lights and darks in your work. Replace lights in areas needed but remember that this is a progression that enables rendering. Don't simply recover what you made light in the first round. You intend to build forms! 8. Continue with all over glazes or spot glazing and spot lifting (with light values) until you are pleased with the result. 9. Have fun - it's magic!