Why are there different types of hollows?

[beimero]

Here's a few examples:
1.

2.

3.

What you guys think?

 

[GonorrhoeaGobbler]

sean is downgrown the other is bc of this bone in your cheek

 

[Scandicel]

Here's a few examples:
1.View attachment 4557251
2.View attachment 4557256
3.View attachment 4557259





















What you guys think?

think bro, think.