>>1007388
The mesh in the "shaded result" was tweaked from the one I was working on when I made the first screencaps with the grey matcap. The topology is the same, I just made slight alterations like making the chin less pronounced and the nose less protruding and dozens of tiny tweaks like that. I was making the entire thing from scratch, so it's a given that I'd modify things as I went. I typically make it "mostly right" and then wait until I add materials and hair to fix issues with the face. Here's how it looks like in the end with a matcap. If I understand correctly, you're saying that there's a very pinch-y "V" shape on the upper and lower lip/chin areas? Like, way too sharp? If so, yeah, that was an issue that I modified later. But you still want a smooth "edge" to it, because most non-chibi anime heads have a smooth "edge" there instead of having the mouth area be completely curved from the bottom view. At least that's the way I make anime heads, so it's one way to do things if nothing else.
If you wanna inspect the mesh yourself but are wary of getting space aids from the attached .blend files in the earlier posts I can give you a gltf or a fbx or whatever.