Haven’t done one of these in a while!

Now I am running into the issue that I want to work bigger (bigger paper), as Jeremy Tinder instructed I do, to get finer detail and avoid hand cramps, but my scanner bed is only 8.5 x 11″.  Scanned images have better resolution, colors, all that jazz, which I cannot replicate with my current point and shoot camera and overhead lights, so the precision of a larger drawing is lost.  Aagh, problem.