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 whom Jem has been given the assignment by Atticus of reading each afternoon, Scout
employs original similes, to say the least:

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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.