I know this post is 7 years old, but since it raises the subject of hanging mirrors, I'll tell a story.
When my mother and her husband moved to Pennsylvania, she hired a mirror company (are there such things?) to hang the mirror that was part of my bedroom furniture.
As they were working, she offered them the J-brackets that had been used in the first home where we had the mirror, and in the second.
The guy said, Oh we don't need those.
TWo hours after they left, the mirror fell off the wall.
Broke the glass and the frame. The jerky company replaced the mirror but never fixed one corner of the frame. The mitre had a gap of almost 1/4 inch. It was expensive furniture, solid ash. with two matching dressers, a desk, two single beds, and a night table. My mother was over 65 and didn't fight as hard as she would have when younger.
This guy's mirror was 32 x 48, no smaller than mine.. He shouldnt' be relying only on picture wire and eyelets.