This is an "in the eye of the beholder" issue. Bob was a very prolific painter, but his art has an esoteric appeal. He used to sell them for $50-100 each, and would sometimes do one on commission for a bit more. The proper way to fix their value today would be at auction. His daughter was trying to organize a gallery show with his remaining work. I'll drop you a line if I see it advertised.
This is an "in the eye of the beholder" issue. Bob was a very prolific painter, but his art has an esoteric appeal. He used to sell them for $50-100 each, and would sometimes do one on commission for a bit more. The proper way to fix their value today would be at auction. His daughter was trying to organize a gallery show with his remaining work. I'll drop you a line if I see it advertised.