The mirror should be placed behind the sofa because your sofa is facing the door. Both the host and the guest can see their own appearance as soon as they enter the door, which is convenient for sorting out their personal image.
If you want to change and don't want to move. Yes:
Buy frosted transparent stickers (there will be them in the shop where you buy wallpaper, and they are generally cheaper. It is basically the same as that used by students in Bao Shu, but it is better to stick it on the glass in terms of adhesion and quality. This will be more convenient and other patterns can be replaced or peeled off.
Etch the mirror glass with solution (this is more troublesome, someone will do it in the glass shop. ), let it produce patterns. The disadvantage is that it is difficult to clean.
If you want to move the position, it is best not to put two mirrors facing each other, especially those with the same specifications (except the dance studio and barber shop). Because staring at the time will lead to dazzling, and in severe cases, hallucinations will occur.