Definitely gonna at least partially retcon this. I was trying too hard to make this prompt fit into lore, so it really feels like a stretch to me. If I did this prompt again while still keeping with lore, I'd do something about pumpkin/gourd carving.
"Lumerians have many uses for gourds. From a portable source of water for waterbenders, to cups, bowls, and decorations. One place gourds are used as cups is in part of the Lumerian wedding ceremony."
Program: Clip Studio Paint
Tablet: Artisul D16
Time taken: 1 hour 50 minutes