>>92162770I didn't specify the mouth, the prompt was
"irys \(hololive\), santa costume, outdoors, (stuck in chimney), >_<, bursting breasts, on roof, snow, snowing"
"Stuck in chimney" isn't a tag, but there's a lot of art tagged with "stuck" and "chimney" as well as "in_{object}" so the model understands it well.
Original image
https://files.catbox.moe/j4beeg.png