A Martin Carthy image print done by Bellamy in 1984 (ltd. to 200, signed and numbered) sold for about U$100 on eBay five years or so ago.

You'd have to think that an original oil with a great musical association should be at least 10 times that? Especially for charity...

(Richard Thompson was offering a house concert in the US (without travel and expenses) for U$40,000 in his last crowdfunding appeal. Draw your own comparisons.)