The ideal solution for hanging pictures on plaster is to use a picture hanging system like the all in one click rail cable hanging kit.
Hanging pictures on lath plaster wall.
The best option mostly depends on the weight of the picture in question.
If the pictures are small and equipped with a wire on the back use a small picture hook and nail.
For lighter items simply screwing into the plaster with a 1 1 4 drywall screw is usually enough to get the job done.
This system works by simply installing a rail along the wall and pictures then hang from cables attached to the rail and are fastened with hooks.
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.