I hate to interrupt this fascinating technical discussion, but must report that I've just completed a graphite drawing. (actually it's been languishing for a while). It was started well over a year ago, and has been mostly sitting. As I'm trying to figure out what to paint or draw next I figgured I might as well touch it up and call it done. It's called
Portrait of Wall Street
There is something of an interesting story behind the photo (it is NOT one of mine) which is located here:
http://nullermanden.deviantart.com/gallery/#/dx7fnh