Two final quotes from Two Worlds of Andrew Wyeth: Kuerners and Olsons (once again, quotations that I find relevant to writing):
On doing many works centered on the same subject:
"A change of subject is really very unimportant to me, because there are always new revelations coming out of that one subject."
say sometimes, 'Will your [paintings] last?' I tell them I don't
[care]. I'm painting for myself. If my paintings are worth anything--if
they have quality--that quality will find a way to preserve itself."