This is the fun part. Still using lots of the same medium, I use transparent colors placing darks of any color in the dark areas, medium values of any color where the medium values are and the in the lightest areas I use only Indian Yellow. This composition is pretty simple, being mostly dark and light. The medium values are only in the shaded areas of the skin.

You can see my computer monitor on the right where I had the images of the original photo as well the drawing I did.

Next time I'll quit noodleing around and actually start the real painting.