Love your bathroom!

I would suggest keeping the mirror fairly simple so as not to detract from your lovely tiles. I would probably do a framed mirror that shares the vanity's width and color. Also, I agree with sconces. Is the vanity in a corner, or will you have wall space on either side in the plane of the mirror?

Very nice so far!

Here is a mirror idea. https://www.potterybarn.com/products/kensington-mirror/?pkey=cbath-mirrors&isx=0.0.25

For lighting- is there another source of light, or will the sconces be the only light source? Lately I have been very disappointed with the amount of light output in many of the available bathroom sconces, so you will want to check that. How wide is that vanity? How much room will be available for the sconces once you have a mirror? The mirror above is 19" wide.

Thanks, both! Vanity is 36” (along the wall, but not much space between it and corner). There is a can light above shower, and there will be an exhaust fan. I don’t know if it will have a light or not, but am also concerned about enough light. That said, it is largely only going to be used when entertaining, so am going for a flattering “restaurant” look. I have an old RH Dillon pivot mirror I got 5 years ago for a different bathroom project, but didn’t use in that project because I thought it was too small once hung (18 x 24), but also was looking at that PB one.