I thought I'd show off my new setup. That's my iPad on the left, strapped in with its shoulder harness. ;-) A couple of strips of artist tape keep it from sliding off the ledge. I can gesture the surface and kick up the image size too. This setup works really well for a guy and his bifocals!
Of course, working from life is the way to go. I wish I'd been able to better light this subject but I was boxed in by the roadway and without gloves and proper packaging so I wasn't taking this specimen home.
From this side by side comparison, it's easy to see that I need to warm up the subject considerably. That's for tonight's work.