Have you found anything that is close to what you like? Can you post some inspiration pics?

I really don’t. It’s so hard. My previous mirrors had dark frame and it made everything so dark.

Some options:

This is a simple mirror "framed" with wood painted to blend into the wall. Any glass company can cut mirror to any size. That would accommodate the differing sizes you need. Then you can "frame" it with wood trim or leave it unframed.

Abacoa Complete Home Renovation · More Info

Here's one that has no frame, simply a sheet of mirror installed on the wall. I think that would work best for your application since you have two different sizes. This one has lights mounted over it like yours would.

Coastal Rustic Wild Woods Kitchen & Bathroom Remodel · More Info

This one has the same treatment but not covering as much wall

Little Compton · More Info

You said you wanted it to pop. If both the mirror and the light pop, then that's too much. I'd go with a plain mirror and get lighting that pops. The style of lighting would depend on what you like.