Melle - it is from an Italian wallpaper company. The product is applied much like regular wall paper, then various coats of finish are painted over it to waterproof it. The vinyl paper can go over dry wall but my constructor was too nervous and installed waterproof kerdiboard (or something like that, sorry, forget the correct name). We should have ours completed and installed next week, the picture I posted was an inspiration pic. Here is the company: http://www.wallanddeco.com/en/18-collections--Wet-System

what are the colors of the room?

There isn't a rule for light height since wall heights vary, but placement will control the quality of light output. I don't think you mention if these lights are doing all the work for the room or if there are can lights above, or if the vanities are in an alcove vs open in the room. You could lower lights to 80" but you mention you don't want all the extra empty wall space above. I've seen photos where folks take the mirror higher than the lights and lights are mounted through the mirror. Might be easier if you draw it out to see where you want light placement because mirror size will play into it. For example if vanity height is 36" including countertop, will there be a backsplash included to factor in? If there's a 4" backsplash, and you want light at 80" that still leaves you about 40" to work with for mirror placement. Or you could have mirror custom cut to sit at top of backsplash and go to height that works with light placement. The best lighting is closest to your face, so without sconces, you could look to buy a lighted make-up mirror to get the closer up view when you need it.

You could trim out the mirror like shown here, attach the sconces on the mirror and try decor on the vanity like shown. that's one way to decorate w/what you have. two mirrors, some type of tile on the wall (or a wallpaper) bring in a tall vase/stems for the middle decor accent. I'd also do a much larger area rug in front of the vanity. I like this one. look at the wood accents on the vanity. you need this w/all of your grya/white for some warmth. the vase/tall stems on a wood vanity tray. the gold sconces on the marble tiled wall behind the vanity. I mocked it up for you. I'd bring in some greenery w/a few hanging plants or orchids. or, bring in a trim carpenter and have him do something like this w/the mirror: or like this w/the sconces on the sides of trimmed out mirrors, nice lights right above taller mirror. I'd do a nice chandelier to reflect back Right now it's just a generic white vanity w/white/gray floor tile. amp up that wall w/peel and stick wallpaper. there are thousands of options (try wayfair or Home depot) At least you'd have something on that wall. or , tile is an option how about tile and some cool mirrors? you could do two taller mirrors, diff lights more ornate type of mirrors, diff llights taller mirrors w/some pendants, and vertical planks