Why Follower Dosen't Have Face Expressions?

i made a follower replacer mod following this guide. it's for Miraak. i tested in game everything works fine no neck seam or anything.

but he has no expressions. his mouth dosen't open while talking. he looks like a mannequin and it's knida weird....the guide didn't mention something like that i don't know which part went wrong.

can someone help me? or is there a guide tell you how to fix that?