Portraits are a tough one to sell unless people can actually see what it is. They have a tough time wrapping their head around the fact that it is a single sheet of plywood that's self contained. I'd keep a couple in your trunk with the original picture tucked in the corner of the frame so people can see it first hand. If you're relying on internet sales, perhaps make a video really showing what it is. If nothing else, some closeup pics at different angles, perhaps the ply without the backer, etc. Really drive home the "magic" of scroll saw portraits.