do you get a usable breeze from that height? if not, really, put in a chandelier.

i'd advise a chandelier that is large enough but that you can see through, not a solid glom.

I would paint the insert over your fireplace an accent color...........this color taken from your hearth stonework. I would select something more exciting than a clock for over the mantle. I colorful painting would maybe be the best, but I have placed an antiqued glass mirror for this illustration and included a double tier chandelier to replace the fan.

Here is the link to the ASID about becoming an interior designer. I hope this will provide you with answers.

https://www.asid.org/content/becoming-interior-designer#.Vgli-_lViko

The mirror was from Ballard Designs

The chandelier from Circa Lighting, though I'm sure there are lots of chandeliers similar in design.

use a mirror if it reflects something nice. if you can hang art opposite it would be good. if it just will reflect a heating vent and something awkward, i'd use art over your fireplace as you have lots of real window going on there anyway.

Like I indicated, mirror would not be my first choice. Looks like the room could use a painting over the mantle.

http://www.greatbigcanvas.com/category/contemporary-art/landscapes/?shape=3&page=3

The mirror will reflect whatever is dropped down from the tall ceiling. Right now I don't know if that is a blank wall or balcony. Have to always be careful with mirrors to know what will be reflected. Yes the chandelier will be reflected in a mirror.