@Kill
I have check the mod and found the reason. Because I wanted to make the obvious differences between face expressions, some face expressions didn't involved the grin. Since I am busy in working that the leader gave me, I don't have a time for the modification. If you need a modification version, you can ask someone to do a favor. I can provide the project files.

@Kill
Thanks for the notification. I will check and fix when I have the spare time

The big grin isnt present. All the other features are pretty much exactly as they are on the screenshots you provided there but ingame the grin is missing.