This is so useful. This helps me to understand some face expressions used in several types of manga.
However, I think there is some problem here: You don't put the name for the expressions. This may cause some problems for someone who write their story as they need to describe their characters' face expressions. I, too, have some problems to my characters' face expression in my writing. I think you can put the description of the face expressions in your artist's comment so it can be more helpful, not only for manga and anime artists but to writers too.
I hope this can be helpful to you. I just want to express my opinion towards this.