You are kidding right?
Go complain about the other thousand animation errors, not the one sene that was well done
Cartoons are not volumetric, they are perceptual.
The girl has a face design for when she faces forward and one for the side.
The retractile snout is just the continuos transition, it's the only way to make the head turning smooth.
If you are going to complain about something, it should be that her front and side design give the impression of completely different faces.
Given the artstyle of the show, I love both designs, as front Ashi is 10/10 qt, but that lack of jaw and small mouth would look like a bone disorder from the side
It's very common to rearrange a character to fit how it should look as they turn their body
Pic related was filled to the brim with that little stuff>>92186637
the nigger skull is tilted bakwards, to exagerate the snout
that hamlet is looking up