No actual boards were scratched in the creation of this picture. I took my original pencil sketch scan
I think I have hit upon the right method for this particular book, which has a lot of physically dark scenes. It's a very forgiving method. Easy to "re-ink" an error and "scratch" again. Better than real scratchboard that way. Also better in that I don't have ink crumbs everywhere and a hand cramping around a knife tool. It is significantly better than real scratchboard in the amount of control I can get over finer details like facial features. That and the fact that it is FUN are the most important reasons to carry on with this method.
Next, I will work up light pencil sketches for two more chapter illustrations, then give them the Photoshop scratchboard treatment. As I get better at this method, I may decide to rework this illustration too. And I need to be thinking about a sample cover illo to submit with my query packet. Perhaps a "scratchart" illustration in color.