Not aligned properly but this what I would do.

I would raise the height of the vanity lights first then proceed with millworkman's idea. Spend little more to get the looks you want. You will not regret.

Not a designer by any means, but when my mind tries to fill in what is missing, I see two round frameless mirrors.

Mirrors are definitely one of those personal choice things. I think you’ll benefit from photoshopping some ideas to see which jumps out to you. That is what we did as we were designing our home we built. And if you’re not familiar with photoshopping, you can always print things out and do it with scissors!

With a larger vanity with double sinks, you can either go with two smaller mirrors or one large. If you're looking for a more modern approach but still want to keep the bathroom interesting, we would recommend going with two smaller mirrors over each sink. If you're looking for something that's a bit softer, we would recommend our Cheyenne Nickel mirror. It's a rounded mirror with a thin frame so that you're maximizing your mirror space. If you want something a bit more rectangular, we would recommend our Highland Nickel mirror.