for the overhang shade, what I do, some is also how we did it in shipbucket in the past, was to have:
1 line of dark (same color you use for marking a break in the surface) shade followed by 2 line of standard shade color. occasionally I shade a little more (thicker) if the overhang is bigger or more enclosed.
edit: don't worry, we are not trying to pick on you... although it's fun, we just giving you an update