I'd extend the trim over top, otherwise the top of the mirror shows a raw edge, and may highlight an uneven ceiling.

Agreed

debra

Carrying the trim across is an ok idea but will seem odd since you don't have a vertical piece on the left of the mirror. It just lands on the wall. I think that will make the top trim odd.

Maybe do a shorter mirror?

or a tall narrower one?

Just some thoughts

I would do a round mirror there . I do not like the plan for the trim piece that only accents the faact that there is no cabinet on the left . Is this a powder room or a full bath if you really want help it is important to make sure all the choices work together

I like the trim for the mirror showing only across the top (not on any sides). It makes sense because that trim at the cabinet top likely protrudes from the cabinet itself so the mirror would need to be below that trim for a straight cut mirror. Any other attempt to fully or partially frame the mirror will just look too bulky.

No trim across the top of the mirror would be my first choice if the mirror edge is finished and the ceiling is not uneven.

Otherwise consider a flat matching wood picture frame around the mirror.

What do the other 3 walls look like? Are you painting or wallpapering? You may want the cabinet maker to make matching crown/baseboard/trim for the other 3 walls.

You can draw anything but actually executing the drawing IRL can be quite another thing.

Cutting/ fitting/ installing a wall to wall & backsplash to ceiling mirror deep into an alcove is a job that I would not want. Is the ceiling perfectly level/ is the corner perfectly plumb? Additional challenges if not.

I agree with everyone else. We have done the custom cut mirror, so wonky ceilings aren't that big of a deal. I don't care for that look. My favorite is an oval or round mirror. I like the softness of that mixed in with all the straight lines of the cabinets and tile.

I would not extend the trim. We did a custom framed mirror for this bathroom from the top of the backsplash almost to the ceiling and did cut-outs for the sconces so they could be embedded in the mirror.

Beauty and the Baths: Primary Bath · More Info

I did the same thing in my own primary bath remodel.

If you want the expansive appearance a full mirror provides you don't want to destory that illusion with a piece of trim.

Thanks everyone for your comments and points of view. After thinking about it further and reviewing your many ideas, my plan is to get a large beautiful mirror in a frame - either oval or rectangular. It will be a nice contrast to all of the regular shaped subway tiles across from the mirror. Thank you for the comments and the visuals!