Bill frowns, it's hard to tell if this person is being sincere or trying to mock him. He would ask how she knows so much about him, but he was just singing about it.

"Hey lady, ever heard the policy on free performances?"

Namely that most people don't give them. Still... a bit of company isn't entirely unwelcome. Something feels odd about watching the staring match the stranger was having with the literal gaze-filled wall, but he can't place why. It's not as if the drawing actually meant anything.

"Ya like it that much, you should add to it."

Then he can blame it on you when he leaves.