The Witches

Villainess Angelica Huston takes off her mask and wig frequently throughout the movie to reveal she's a hideous demon. Here is the first appearance of the Grand High Witch
The Grand High Witch puts her disguise back on with a little help.
Here is what she "normally" looks like.
Her spare mask.
The Grand High Witch starts to remove her disguise, but is interrupted.
The Grand High Witch is turned into a mouse (an ugly one).