According to feng shui, it is best not to enlarge the mirror where the bedroom faces the bed. In fact, their explanation is: if you wake up carelessly at night, you will suddenly see yourself in the mirror and scare yourself. That's all (that is to say, some ghosts, such as bad things, will be seen in the mirror). If you don't have any psychological shadow, it doesn't matter if you don't put the mirror. So you don't need to put too much, just like you used to put it in a big closet.
If it is a wardrobe with a sliding door, the layout inside and where to put the mirror should be considered when designing.
If it is a flat door, stick the mirror on the opposite side of the door. Details can be discussed with the designer.