I can't draw either, but... the shopkeeper loves people who can draw, I wonder if they want to change their story.

( live in that painted world that nene had told him about, a pretty gilded cage where everything is fine in the inside — they would find themselves led to those delusions, and he can't allow himself to break out of character. he clears his throat, looking up for a moment at the ceiling as if he's searching for something, or waiting for the feline to appear next to him so he can only see a second of them. he glances back down now, staring at the drawing. )

If you won't speak, why not try that alternative... in pictures, images, let people decipher your thoughts.