A: Your mirror is too heavy for picture hooks alone, but a wall anchor would likely do the trick to attach them to a wall made of drywall or plaster. A variety of drywall anchors are available ...
For heavier pictures, anchors rated for plaster and gallery systems ... Tap, rather than hammer, the nail into the wall.
A 1/4 to a 1/2 inch of nail should be sticking out of the wall. Heavier picture frames will need anchors and screws. Use a ...