Based on the dimensions provided, here are some options for configuring mirrors and lighting for your ensuite sinks:

Mirror Configuration:

1. One Large Mirror: This option would give you a seamless, uninterrupted view and make the space feel larger. However, as you mentioned, it may be expensive to purchase and install a mirror of this size.
2. Two Mirrors with a Gap: This option would provide separate mirrors for each sink, which can be convenient for couples. The gap between the mirrors can be anywhere from 21” to 27” depending on the width of the mirrors.
3. Three Mirrors: This option would allow you to place a mirror centered between the sinks, which can create a balanced look. However, it may be challenging to find three mirrors that fit the space well.

Based on your preference for a framed mirror, I would suggest going with either option 2 or 3.

Lighting Configuration:

1. Four Side Mount Sconces: Since there is limited space between the sink edge and cabinet edge/wall, mounting sconces on the sides of the mirrors may be a challenge. However, if you can find sconces that fit in the space, this option would provide even lighting on each side of the mirrors.
2. Two Top Mount Sconces: This option would require installing the sconces above each mirror. While this may not provide as even lighting as side sconces, it can still create a stylish and functional look.
3. Three Top Mount Sconces: If you go with the three-mirror configuration, installing a sconce over the gap between mirrors can create a cohesive look. This option can be a good compromise if you want to have more than two sconces but cannot install them on the sides of the mirrors.
4. Pendant Lights: If you prefer pendant lights, you can consider installing two or three pendants above the sinks. However, keep in mind that pendant lights can be more difficult to install and may not provide as even lighting as sconces.

Overall, I would recommend going with either option 2 or 3 for the mirror configuration and either option 2 or 3 for the lighting configuration, depending on your preference and the availability of fixtures that fit the space.

I'd place a mirror above each sink and then 2 horizontal bar sconces - one above each mirror - or 2 large singular sconces, one centered above each mirror. Yes, you will have a gap in the middle, but each sink area will look complete and not crowded. In the end the gap may not bother you at all. If it does, then find a small piece of art or object you love to hang between the mirrors.

For bathroom lighting I like to go to https://www.visualcomfort.com. Many, but not all, fixtures have pics at the bottom of their pages using their pieces. These tend to be high end designers and some of the spaces are tricky, like yours, but have found beautiful ways to balance it all.

And if you wanted to do a triple sconce over each sink instead of the long center one then that’s fine too.

Love your cabinets, Katie! I had a similar setup that thinkdesignlive shows in their last pic. It’s clean, you can see so much uninterrupted.

How do you plan to store medicines?

https://stylebyemilyhenderson.com/blog/why-designers-hate-most-medicine-cabinets-some-genius-alternative-bathroom-storage-solutions

Think I will suggest two mirrors with one sconce in between.

I put a triple door mirrored medicine cabinet over my large vanity. All medicines and cosmetics are easily seen and accessed - lights above but could have gone on the sides. Functions perfectly and looks good.

I wpuld do anice bath bar above each sink leave the mirror alone na be done I do not like sconces in bathrooms I much prefer really good batbar lighting to light the whole space .

Your cabinet determined the placement of the sinks. Agdd one large mirror as taped. You can add 2 light fixtures, one above each sink Play with the size in order to have proper light.Pendant lights are not flattering whatsoever. They will cast shadows on your face. You need a light that reflects in the mirror and throws light at your face rather than create shadows.

One big mirror with pendants or with lights above each sink, mounted on the mirror.