Ghirlandaio portrait progress, close to finished

Here is the new progress! I worked a lot on the face, using a dozen or more colors and working the light tints into the midtones and the midtones into the shadows. I used a thin lead white to paint the translucent fabric on the bodice. I've mixed several different colors trying to find perfect mixtures for the hair but so far I am not satisfied so the hair is the most unfinished area. In a raking light the black background shows the areas where my sanding of the gesso was less than perfect and the effect is enhanced now because the paint is so matte. I think that once everything is finished it will have a soft sheen and scratches won't be noticeable.