A modern rectangle mirror would be your best bet (style below would be complimentary). I would also suggest removing the small towel rack, as its style doesn't suit your bathroom and feels odd in that location. To maximum space in your small room, maybe consider using the area over the toilet for storage and your towel.

Thank you, Maureen. Yes, the towel rack next to the vanity is a departure. I don't think that I want my bathroom to be too cold with its contemporary styling. This rack is an attempt to add some whimsy or wood tones to warm it up some. But it probably won't make the final cut. Thanks for your recommendation on the mirror.

My thoughts on the area above the toilet are either a nice piece of artwork or possibly floating shelves. I have a towel rack (luggage rack styling) on the back wall of the shower and a recessed cabinet opposite the vanity that I plan to cover with a full length mirror.

I agree to use a rectangular mirror with a very simple narrow frame, or just a beveled edge mirror. I would have an electrician move that outlet over the sink to the other wall first though.

I'd consider taking your mirror surface from the top of the backsplash all the way above your light bar, and, if you're open to it, doing the same treatment to match height above the left side of your vanity to mirror the corner. You'd have to adjust your outlet plate cover to mirror to blend in but you'd minimize borders for reflection. To me, that's contemporary and sophisticated, and helps make your bathroom feel larger and brighter. Cheers!

Thank you, Chi Renovation. Do you think that the mirror should be frameless? or maybe a silver frame?

fairwaystyleliving, that sounds like a look that I was admiring just last week at the Parade of Homes. Thanks!