Well, I made a mistake that over-wrote some of the iterative saves of my file. I had to re-create about an hour or so of missing work, and then I shaded with hatching the main values on the girl. I thought about making the lines much darker, which is why I switched her from a blonde to a brunette. The black is way too dark, though. What I plan to do is use the solid black parts as Magic Wand selections in Photoshop to be able to mask those areas (blocking out all the rest of the drawing thereby preventing any lines from straying) and shade them with some kind of pencil. I'll delete the black and be left with proper shading.