Okay so I got tired of drawing the face before doing my shading because it takes time to meticulously draw them only to ruin them with practice shading. I've thought about abandoning this technique but then I realized that the only reason I would be doing so is because I haven't practiced it enough to become the master I would like to be.
In these exercises I lightly laid in my colors, one on top of the other and then burnished. I get a very different look depending on which colors are used, of course. In the square on the right below, I tried something different. I burnished with white first then laid in my colors and achieved a very smooth painterly look.