I don't know Rob but it looks like you are getting the darkness/lightness spot on.
Brad
Dave, I need a favor. From the images below, can you manipulate the section in the second image, adjusting brightness, contrast, etcetera to see if we can extract more detail on the lines?
On my monitior, with my editing program combined with my lame editing skills, I'm not getting much.
Strange question.
If the pencil lines could smudge, why did you draw them on first instead of working on the windows ? I would think all the hands-on might smudge all that hard work.