He passed the second. The Gluttony of Merchants. It depicted a man eating gold coins, his stomach bursting open to reveal rats.

: Go to game/renpy/common/ and find the file named 00gallery.rpy .

: Complete step 16 of the Dark Magic Walkthrough and purchase massage oil.

This is the most reliable "unlocker" method as it forces the game engine to treat all gallery images as "seen."