The concept behind Expletive is about defects of character.
She hides behind a curtain or mask. Her decaying teeth hold a secret. She smokes to avoid feeling or looking at herself; she hides to avoid seeing the truth.
A result of anger and resentment, Expletive depicts judgment of other people’s masks — judging their madness because they judge hers.
Painted on the back of a Van Gogh print, it was almost a ‘screw you’ to the world for having these judgments and resultant feelings.