Whilst spending a happy time in my reference photos for this project I did come across this on my trawl. It is a real life guide that I refer to now and then in big world.
Apologies if I have shared this before but it is a bit of a crusade. 😄 I hate seeing pictures and mirrors hung badly. Apologies too for not being able to acknowledge its source. I have had it many years and have long since forgotten where it came from.
As for how to actually hang your pictures in your project will depend on many things - primarily the historical period of your room. Often large ornate paintings are hung on visible chains - either to a large hook on the wall or even suspended from a brass rod running around the edge of the ceiling or coving. Miniaturising this offers a few challenges. I just prefer to imagine they are invisibly hung/fastened to the wall behind the picture whatever their size, weight, historical period and so all I need to do is just add a few tiny bits of museum wax.