Karin,
I'm sorry to say that I failed to notice any evidence of canvas texture. I can't be sure but I think I recall some reflection from the lights on the upper part of the painting that indicated canvas as opposed to rigid substrate however.
The young man who took my picture is a student of Shanks and he intended to send his email address to me in order that I might send his photo beside the painting. If I hear from him we might have a source to answer your questions. I gave him my card but have not heard from him after 11 days.
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