Up close, you could at least see their pupils. But here, all you see is black. Large, black pools filling up dead, soulless sockets that swallow any approaching joy, like they're the Happiest Dementors On Earth. It's why precisely zero of those party guests look even the tiniest bit happy. They got too close.
Worse still was when they tried to be romantic and adorable:
"Will you make me the happiest affront to God and nature in the world?"
She looks like she's contemplating not whether to say yes or no but rather the best place to bury Mickey's body and not raise Walt's suspicions. What's truly amazing here is they were basing those costumes on these characters:
The only possible explanation is that Walt's designer watched "Steamboat Willie"
while eating a big bag of peyote.