I'm guessing that this is a print, not THE actual painting? it would be worth quite a bit if it was the original.
As a print, it will still have some value, I would suggest sticking it on e-bay.
But if it is the original work, take it to Sotheby's. £££
As a print, it will still have some value, I would suggest sticking it on e-bay.
But if it is the original work, take it to Sotheby's. £££