I think I understand what you mean by 90 degrees. I'm picturing the table perpendicular to the end walls where the china cabinet and proposed mirror are. Is this right? I don't see any problem with putting the mirror opposite the china cabinet. You want the mirror to reflect something pretty. And, mirror do open up a space and make them look lighter, brighter, and more spacious.

We used the top half of the china cabinet I inherited in the library of our former house. I had a plain box base made to hold it, stained it to the same color, and put it behind the small end of an L-shaped sofa, because with its own base, it was too tall to fit in our 8' rooms. It actually started life as a secretary-bookcase, but my great-grandfather, who bought it at auction, only bought the top half, and had a nice but distinctly inferior bottom made for it then. I've tried to find the other half, but with no success. Sigh. So much for its potential value. But I digress ... I put a few groups of nice old books, a couple of pewter pitchers, a plate or two, and some other attractive things in it. I also lined the back wall with a piece of cream jacquard fabric to lighten the whole business. Not sure how well you can see, but here it was: It was traditional in old houses to line the doors of large secretary-bookcases like this one with gathered green cloth to protect the books from sunlight, so you'd be in good company if you decided to put fabric in yours.

Should be able to be dropped in the glazing pocket and re-affixed via brads.

Sammie the candle would work in the middle if the table. the base is metal bird bath which was too pretty to put outside. the other end of the room is my lr waiting fir 2 chairs and an area rug - possibly a small fireplace I think a plant of dome kind would soften that end - something with low light. the ideas are glowing My grandmithers dishes I also have these 2 pictures anove matching buffet in fr or this platter if pictures id think about black and white of2 grand daughters