If you are keeping the existing light fixture, I would choose a simple bathroom-rated mirror that supports the light you already have rather than competes with it.

For a 36-inch width, a clean rectangular mirror or a softly rounded rectangle is usually the safest update. I would look for a mirror with sealed backing, good edge protection, moisture-resistant frame finish if framed, and solid hanging hardware. In bathrooms, those details matter more than people expect because steam and routine cleaning are what usually shorten mirror life.

From a production and QC perspective, I would also avoid anything too deep, too ornate, or heavily tinted if the goal is an easy, durable replacement. If you want a slightly softer look, a thin warm-metal frame or a rounded-corner shape can coordinate well without forcing you to change the light or other finishes.

In short: keep the width close to what works now, choose a simple shape, and prioritize moisture resistance and mounting quality over decorative extras.

Here are 2 recommendations that are both 36 inches if you want to lean into the rustic look:

1. https://www.amazon.com/dp/B0GJBT2VRY?lv=shuf&channelId=500&plpRedirect=mhFallback&th=1 

2. https://www.amazon.com/dp/B0BBTD3HVR?lv=shuf&channelId=500&plpRedirect=mhFallback&th=1

I like the round mirror but I’d go with a smaller wood frame. This one is from Amazon

Forgot the pics…

Thank you all so much! Great ideas!