Well, just the fact that the characters are all dressed up for a masquerade party, already adds to the eerie mood. But what really seals the coffin is when Montressor lures Fortunato into the catacombs, and then ties him up. You really get the whole creepo-vibe, when Montressor starts to seal up the "tomb". Hope this helps you a lot.
So all you have to do is write in the second column what you know. The third is for your conclusion, or your answer
You didn't indicate which piece of glass art the question is about