Found Art

I found this small work of art in a copy of Saul Bellow's More Die of Heartbreak at our local thrift shop. It is composed on a post-it, from green high-lighter. If interested, I will sell it to the highest bidder.

What is it? Comments please....and do not be offended by my guess, but it looks like the Mona Lisa making an obscene guesture, perhaps left behind by a disgruntled reader who was not enjoying Mr. Bellow's novel?