If i were you I would take down the mirrors first and see what's behind them
Here are some ideas for you.
Thanks for the links I really don't want to take them down.
Hi Maria, here's an article all about working with a mirrored wall: https://thecasacollective.com/7-stylish-ways-work-mirrored-wall/
You could put the window cling material on them to change the look with solid or patterned clings. You could also use glass paint on them to cover them completely or give it a stained glass look.
Can't you just remove it and then finish the wall however you want it??
Taking it down would be a lot of work! My husband thinks its drywall behind it.
If you take the mirrors off be sure to wear safety equipment, especially goggles.