And I should add, I want the lights to be above the mirrors, not the sides

We chose to make ours the same width as the mirrors.

With the advent of LED lighting, you don't have to think about heat so much so you can more easily recess lighting. There are a few commercial light fixtures I have seen that I think look good but I'm generally bored with the bathroom lighting sections in lighting sales areas. I haven't done this but I think you could put four smallish recessed or flush-mount LED lights in your space. I think the ones you have planned over the mirrors will be good but won't they cast shadows downward on your face? This might be a new concept but adding a flush-mount (minimalist) light about face height on the right and left side-walls might give you good lighting and not distract from your other designs. Consider using a dimmer so you can adjust the intensity.