The Merchant

The Merchant is a painting that sometimes can be found in underground cabins. As the name implies, it's a portrait of the Merchant NPC.

Trivia
This painting appears to be inspired by a type of Leonardo da Vinci portraits allegedly inspired by an authentic portrait of him held in the Uffizi Gallery in Florence. Many (if not all) are supposedly forged and trying to pass off as original self-portraits, one example being the Lucan portrait of Leonardo da Vinci.