The best option mostly depends on the weight of the picture in question.
Hanging things plaster walls.
For lighter items simply screwing into the plaster with a 1 1 4 drywall screw is usually enough to get the job done.
Simply hanging something heavy on a plaster wall can result in damage to the wall and the object if you don t tap into the supporting structure behind the plaster.
As mentioned earlier avoid using nails on plaster wall because they will likely cause the drywall to crack.
Plaster walls have a tendency to crack and crumble if you attempt to hammer a nail directly into the wall.
Some older plaster walls have a thin strip of wood that runs around the perimeter of a room usually between 1 inch 2 5 cm to 1 foot 30 cm below the edge of the ceiling.
If your room has this you can simply drive a screw through the wood and use this to hang things.
I hope this helps you in your old house decorating or perhaps new house decorating with heavy objects.
Of course you can try this with other size screws but this size pretty much works for anything i need to hang.
Plaster hooks or hanging picture hooks are a common solution for hanging pictures on plaster wall.
Adhesive picture hooks are the best way to prevent damage when hanging a picture but pre drilling the hole will usually prevent cracks and chips from forming as well.
They can generally support pictures of up to 20 pounds.
Screws and screws with masonry anchors for heavy items are your best choice for hanging things on plaster walls without picture rail.