Here is the first follow-up to my post from September 10.
I tried to do a sepia wash, but the ink I used turned out more pink than I desired. I used pieces of sand paper to remove the stain, scratching deepest into the areas intended to be the ligthest.. I then experimented with thin washes of white acrylic pant to emphasize the highlights. I then went back in with pen and ink to bring back some of the line detail.
And for reference, here is what it looked like a few weeks ago. Should I have stopped when I was ahead (a head?)? I'd love to hear your thoughts.