I would not do two mirrors with a centered light fixture.

Your light seems low. How much space do you have between the backsplash and the light?

I think if you do full mirror, it should sit on backsplash or the gap (whatever is left) will look odd. We did a full mirror and had them cut three holes for wall sconces.

Largely preferrence. I'd get separate mirrors for each sink.

Shouldn't be too difficult though. Surely you can buy a large one and two smaller ones that can all be returned, and try out both looks.

Thank you all! I like the photo of the mirror that Mayflowers posted. I have 36" between bottom of my light fixture and the top of the backsplash, and 89" from wall to wall. I am thinking the mirror with frame should be approximately 32" x 81". Does that sound right? That would leave 4" on either side of the mirror, 2" above and 2" below. Or should I do a skinnier mirror? Also, what color frame? My shower has white wall tile with pebble floor (white, grey, little bit of black). The bathroom floor tile is a greige. I have the same finishes in my guest bathroom and put back the mirror I already had there with a grey frame. I've attached a photo showing the mirror in my guest bathroom. Not the greatest but not the worst so you can see what a gray frame looks like with my cabinets. TIA!

I have always estimated the narrow mirrors to be around 30"-32" high. You can tape it out to see how it looks. Make sure to add in the frame width so that you have mirror starting at the edge of the sink, not frame.

I would do the frame in the same wood as the vanity. I think these narrow mirrors do need a frame and a flat 2" frame won't add another element. With your slab doors and door fronts, it's not too much.

This one doesn't have a matching frame and I don't like it as much.

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You could frame your mirror in brushed nickel, or whatever material your faucet is. This would not add another element.