My mirror is roughly the size of yours. When planning my remodel, I used a 60" wall in my bedroom (the width of my vanity) but could have easily taped out a section of any wall.

The blue, horizontal tape in the photo is counter height, and I hung my mirror there.

I then cut out sconces in the rough size of some I liked and taped them up to see if I liked the dimensions.

I did.

Thanks for the tip! I've done something similar in my bathroom and put up tape but don't have the mirror (medicine cabinet) to hang up. Your bathroom looks beautiful!

@mindg - tape up everything, including mirror/medicine cabinet - sounds like you’re on the right track!

Also - do a Houzz photo search of “mirror sconces” and see what pleases your eye.