You may have a die clash from the obverse die. Liberty's nose lines up right around in that area. I can't tell for sure without better pics.
Not a S, again where would it come from, and not a nose from a clash. A nose clash Mark would be lower. If it’s a clash, it would have to be from the chin. Would need better pictures of the area to tell.
Nose, chin, lips somewhere right there is what the arrow is pointing to. The coin is not worth sending in for grading.