Consider black and paint the vanity a happy color.

How wide is that vanity? The mirror should be at least a little narrower than the vanity which will limit your choices. Look at mirrors the right size and see what appeals to you. If nothing interesting is available, maybe rectangular with rounded corners would work. Just change the pulls on the vanity. The vanity top will restrict the color choice if you repaint it and if it's still in good shape I wouldn't bother. If you have some wall area, perk up the space with art.

Agree with @kandrewspa I’d get a metal framed mirror to match metal of new light & change door pulls onvanity to same metal. There’s enough wall space either side to wall hang a towel ring. Get rid of standing one on vanity that’s wrong metal & free up counter space for pretty soap dispenser. Yes to art!

You have a traditional vanity and a modern light fixture.  Unless you plan on painting the vanity bright color you want something that bridges the two styles.  I like the idea or a frameless mirror in rectangular or geometric.

Consider a pivot mirror. I have 2 classic Minka Lavery pivot mirrors: one in each of my upstairs bathrooms. My husband expertly installed them. They are well made and great quality too. They come in all types of finishes, shapes, and sizes. Check out Minka Lavery’s website!

@kandrewspa Thanks. Will change out the vanity pulls for sure.

@kw - thanks - so the mirror should match the new light fixture. Got it. Like the idea of a towel ring on the wall instead of on the vanity.

@susan: thanks for the pictures - this gives me a starting point.

Your photo is a bit distorted, in terms of the actual scale of the vanity, light fixture, etc. - so this visual is also a bit off. But hopefully, this gives you the general idea; and I like this hexagon shape - except, on this one, I would go with a silver finish, to complement your light fixture, etc.

Alternatively, something like this octagon shape shown below might be fun. I like the glam element on this one. And although it is noted as having a gold frame, a few of the reviewers say that the frame is more of a copper/rose gold. So if you wanted to mix metals a bit, this could be one option; and the gold/copper would pick up on the warmth of your vanity, granite and floor.

Width of vanity is approx 28 inches. What do you think of this mirror?

@rh I like it! Simple style & nice with light fixture And, oh look, there’s a towel ring on the wall in picture! 😁

Wrapping the room in mural wallpaper would definately give it some oomph!

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The right tile choices can make a big difference!

Included here are some of our bathroom designs which might help you figure out which type of mirror you'd like to have over your vanity.

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It is a PR a mirror not larger than the vanity first then no towel bar or ring in a PR a nice stack of paper towels one use are the right choice for PRs I never want to use a towel someone else used that is just yucky and now even worse you can get nice disposible towels meant for PRs and with a small wall mounted holder I would do a prtty oval mirror with the same meta as the light if it needs a frame take the rug away and change those bulbs to LEDs 4000KSome fun art and you are done.

Kimberlee Marie Interiors thank you for the pictures.

Personally I think the vanity light is over kill, I would not put 4k bulbs in a powder room, that will light up mars. the issue is because of the size of the vanity light, the mirror is going to end up looking small. The mirror needs to be scaled to the size of the vanity itself, otherwise you will keep making the vanity look smaller.

You could also change out the faucet to something a bit taller to give more umpph and change out the cabinet hardware. this is a terrible mock up but the angle was hard.