1. Using adhesive picture hooks – particularly in humid areas.
They’re not up to the job and your artwork could end up on the floor. When removed, they often bring a strip of underlying paint or wallpaper with them.
2. Using a hook and cord that are the wrong weight for the picture.
You can’t catch marlin with a hook and line designed for whiting, and pictures are no different. They won’t hold. If in doubt about what you should use, ask for advice at your local hardware store or picture framers.