We have a very small powder room that is about 40 in wide. We are installing a cabinet that fits the space, and the sink is above counter. Countertops are quartz with a backsplash appx. 8 inches in the same material. Ceilings are 9ft. We have 2 pendant lights on either side of the vanity hanging from the ceiling.

Should the mirror be wall to wall and all the way up to the ceiling, or should I find a smaller mirror to fit the space.

Thank you!