The other problem is time. The Robert Johnson type paintings take anywhere from 10-15 hours if guess. I did those before kids. The new ones are about an hour Id guess
People love the ones you've already completed. There are TONS of people selling prints of their work for ~$20 each on Etsy. Some even just sell a digital version that the buyer can print and frame. You keep the originals Andy out don't feel guilty because you aren't taking piles of money from people. Respectable profit and people are getting a good product.
Set up some prints of the best 5 or so and see if they sell. Put some of the older ones and some of the newer ones and see which sell.
You are uber talented, should get a few bucks for it, and there is definitely demand.