You decide to put the Devil's Kiss into the painting. It fits, and the fog turns red. It starts to get a little hot in the room.
About a minute later, the fog dissipates. The Devil's Kiss is glowing. You decide to return the glowing liquid to your inventory.
You focus on the painting and you color it in, a dark green mixed with gun metal gray. The painting starts to illuminate, and a key falls from the canvas to the floor. You pick it up, and you now have a Key of Spades. You put the key in your inventory, which is now 6/30.
The thorns unravel from the door, and the same giggle can be heard from before. What do?