I‘d suggest adding a window treatment to create a balanced wall and room and skip anything in between. Just bring home mirrors and test various sizes and configurations.

If you don’t mind unsolicitated advice, the blue bench and settee feel awkward/impractical. If interested, provide a picture of entire room and you’ll receive helpful advice.

Art …. would be more interesting than a set of mirrors. I’m not that fond of mirrors in a dining room anyway.

I don’t want to see myself chewing food so no mirrors. Fine a lovely piece of art to share.

Thank you all for the input. I'll skip the mirrors & look for something else.