Diane, I would love to see some photos of what you're doing... what are you calling "character sketches"? (The "very lucrative" part of your sentence jolted me from my stupor tonight.
) What is your set up - do you use lights? How do you manage the wet canvas handoff to the client? Do they have the right to refuse the painting?
Judson, for arguments sake, let's go for one apple on a plate. I want you to be able to determine if the materials you plan to use can get you to a reasonable sketch in a short time period.
Fifteen minutes... Tickticktickticktick....