To receive this quest, you must talk to Yaromir while waiting for the auction that takes place during the "Open Sesame!" quest and indicate the correct painting - the portrait of the merchant with the pearl, and then buy the van Rogh painting during the auction.
Geralt is often taken for a boor. Nothing could be further from the truth: though rough-and-rowdy in outer appearance, inside Geralt harbors a sensitive appreciation of beauty and the arts. It should then come as no surprise he was able to impress the art merchant he met at the auction. The connoisseur tipped Geralt off about a van Rogh painting soon to go on the block. Apparently Marcus Hodgson, a famed Novigrad book dealer, was ready to pay a small fortune for it...
