What are some similes used by Scout in To Kill a Mockingbird and to what do they refer? Harper Lee's To Kill a Mockingbird

In describing
the sick, addicted, and dying Mrs. Dubose, to whomhas been given the assignment byof reading
each afternoon,employs original similes, to say the least:

She was horrible.  Her face was the color of a dirty pillowcase, and the corner of her
mouth glistened with wet, which inched like a glacier down the deep grooves
enclosing her chin.

 notices that Mrs.
Dubose's corrections of Jem have become fewer and fewer.  And, something has happened, for only
her head and shoulders are visible above her covers.  As her head moves from side to side, Scout
sees saliva collecting on her lips:

Her mouth seemed to
have a private existence of its own.  It worked separate and apart from the rest of her, out and
in, like a clam hole at low tide.

Occasionally
it would say, "Pt," like some viscous substance coming to a
boil.