Further investigation of the room reveals a painting on the back wall - it was difficult to notice through the rime at first.
From east to west, the following three scenes are painted:
A wild spray of multicolored dabs of pigment, each small, round, and either red, green, yellow, or blue along with a simple black square; a member of the frozen race encountered here by the party kneeling on one side of a small white square, atop of which is a red smear of paint, with five figures with overly long fingers and ovoid heads standing on the other side; the long fingered figures standing in a line with tear drop shaped dabs of orange pigment to either side and a simple black circle bisecting the line.