I had my wiring for outlets, sconces, over head fan and ceiling fixtures all done before mirror, fixtures, vanity and cabinetry were added. I have a small oval tilting mirror that is only 24 wide over my vanity it was dirt cheap from lowes and they had rectangles too. Under 100 dollars. Your contractor should be able to drill with a new and properly sized drill bit to tile without issue and if it cracks the tile can be easily replaces. I know cause glass door guys broke a tile on their last hinge using a dull unchanged bit and my tiler fixed it is less than an hour. I can not attest to its quality but I love my cheap I mirrors function. This is similar to mine might be too short at 24 I think. https://www.atgstores.com/bathroom-mirrors/gatco-elevate-small-rectangle-mirror_12643290.html&ppc=2615&af=2615&cm_mmc=sce_google&s_kwcid=AL!4500!3!112410639507!!!g!189703215387!?gclid=CIyj4OfV0M4CFUMkhgodpYQGxw&ef_id=V2mUpwAABYlpJA92:20160820185548:s

Honestly, you are putting way to much into a space you will have to return back to OG when you move out. As far as the paint goes you get a color match done heck even ask the LL what color it was for touch-ups or something. Im not sure why you need to change it, and you are getting into stuff that is not really "quick rental fix" I could tell you a lot about how to do it but I really am wondering why you would want to put this much into changing 2 lights and a mirror, I think the mirror is really cute, fits the space Now you can buy plain frosted glass to put in place of that glass that is on the current light fixtures, upgrade the light bulbs and that would be a good start.

A while back I told my customer to take a cardboard box and make a box the same size of the cabinet she wanted to get and put that on her existing vanity in a way that she will be left with the same amount of space she will have in her new configuration. (in your case it would be 24"). Try doing that and see how it will look and feel before you go for it. If you be OK with it, go for it. When she did that, she changed her mind and when she changed a few things around after it was done, she said it was the best thing she did. Good luck

You are right to notice something is out of balance. The sinks are far apart and there is a large space in the middle. To make matters worse the backsplash on the sides is higher and the back wall has only the vanity backsplash. But not to worry you can still bring balance... Short of switching tge 2 mirrors for a large wall to wall mirror, a few options would be to add either a shelf, a plant or a towel rack inbetween mirrors or decorate the back wall with a wallpaper or a contrast paint. It really depends on what else is there in the bathroom and how much more effort you are willing to put in. Here are some ideas One large mirror all the way Or just below the lights Towel rack inbetween Contrast paint and tall object inbetween Or wallpaper A few suggestions: