Why not leave traces on the murals?

One way is to use seamless hooks. There are two kinds of hooks, the most commonly used one is nails. There are four small steel nails on the hook head. When you don't want them, take off the plastic parts. Steel needles can hit the wall, and there is almost no trace outside.

There is also a kind of adhesive tape, the common one is "3M seamless hook", which is different from the ordinary hook stuck on the wall and will not leave any marks on the wall after being removed. If the room has a ceiling, fine wire can be hung from the ceiling to hang photos or paintings, which is what art galleries usually do.