Now this is where there was a flurry of work to bring everything together. A cool violet on the right side adds light behind the head. The contour of the ear is defined by an olive line. However the hair and edge of the head is a dark soft purple so that it dissolves into the light. The space behind the top of the head moves from dark at the right to a slightly lighter value on the left. This shift in color gives a believable depth to the head. Your eye tells you that the head has volume, from front to rear. Bringing in the pale colors and cooling down the reds submerges the volume of the head in an overcast dim light. There is the contrast of the cool high lights of pale blue and warm pink to a soft dim light.