Try wood and glass. Consider hanging the mirror vertically and about 5" from the sideboard top. You could also move the table under the light fixture, change it out for a chandelier, and put the sideboard and mirror on the clock wall where the mirror could double the chandy which should hang 36" or less above the table top.

Just some ideas to think about? Uber big arc light Round uber big leather ottoman Long floor to ceiling curtains with print or color 4 inch trim on either side of the panels hung between the windows. Art work set in the cubes similar but different, as in perhaps, musical instruments, African masks, Art Deco Lallique vases, anything that reflects You translated into art. Back cubes with mirrors and put puck light in the top of each for nighttime drama and to light the art work. A large Fiddle Fig tree as the trendy green this year. Possibly smoked mirror above the TV screen as big as the cut out. Bring it on.

Yes - they just needed help putting it all together :)

These chairs are easy to recover and the range of fabric available today gives you plenty of choice. I say go for it. If you don't feel up to it yourself get an upholsterer, but plenty of YouTube tutorials about.