Nothing horizontal

Why have two sinks when you're going to be rubbing shoulders if you use them at the same time?

1 tall mirror over the sinks together. Boy, this design has gone way off the track hasn't it?

You might want to mount the mirror on SS cylinder spacers

are there two faucets?

this one looks fine because it's centered over the single faucet.

If you are doing two, that denotes two people will be sharing. doing a single mirror would be silly.

Unless, it's wide enough so both can view

do one larger, taller mirror. not too wide.

or go more vertical, but not too wide

are you doing some pendants?

the two tall skinny would be ridiculous, since they'd be too narrow to even view a face fully!

This is about as narrow as you would want to do. maybe 14" ?

This photo, BUT join the 2 mirrors (by having mirror in that middle section) to make one large mirror. This ratio works well with the ceiling height and width of the vanity.

What is your lighting plan? Ceiling hung pendants…that will cast shadows down on your face? Sconces? How tall are you and your partner? There is no way I could see in your mirror OR put on makeup without side lighting. Is that a trough sink or two sinks? I can’t tell. Where is the counter space or storage space for your stuff?

I appreciate all the feedback, I think I will go with @chispa and @Beth H. : suggestions of one vertical mirror going up to about 4' below the ceiling.

I am doing 2 pendant lights. The question now is should I do black everything (pendant, mirror frame, faucets, etc) or do gold pendant lights and gold framed mirror while the faucets are matte black?

Thank You all!