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Jeff Wilson: especially if the image was supplied by a known artist like Fechin. (Though I think Casdoe's dad is misrembering Rudesinde as "Fechin" when he talks about the scampy, long-limbed boy artist.)
Careful Jeff. YOu are going too far down my path. ;- ). Rudesind was a boy
artist who meets an artist ("Fechin, Fechin, himself"). Rudesind's boy portrait includes paint brushes which is an old "mystery" prop which allows the solver to figure out the painting was a self-portrait. I.e. Rudesind is Fechin. If Fechin had painted the picture of Dorcas then yes, it would be worth a lot of money, as Ouen's words suggest. So Fechin/Rudesind is Dorcas' husband. Both Rudesind and Dorcas' husband speak in the same folksy dialect. Bent, twisted monkey stuff all around.
I'll stop there but you can probably guess where it is headed.