The term “camera shy” usually refers to people who are reticent to have their photograph taken. Signs like this one which I walk by most every day make me hesitate to make use of my camera.
Talking about “graphic representation” is going to drive away any artists fearful about carrying a sketch pad into the area.
Isn’t it enough to make your anti-photo statement without the threat of violence?
Perhaps just someone who can remind you that they don’t want photographs taken in the area.
Maybe I can work to get over being camera shy.