Is the mirror in the master bedroom facing the wall harmful to Feng Shui?

Feng Shui does not advocate the use of any unnecessary mirrors. Even if you really want to use a mirror, it is best not to show it in public, such as a mirror in the toilet or a mirror hidden in the closet.

The mirror to be used, such as the mirror on the dresser, can also be used with the door, or covered with cloth at ordinary times and opened only when it is used.

Judging from your picture, the mirror and the mirror are in a narrow passage, and the distance is very close, so there should be no influence, let alone the bedroom.