No mirror above FP, it is too high. Hang 2 of the large frames stacked over each cabinet. Do you have another lamp? Remove small stuff from mantle get a piece of art the size of the firebox for over the mantle. Look at art.com minted.com icanvas.com

No mirror and IMO I would remove the mantel and just hang a nice piece of art there . I assume the black parts are vents.

Two of the framed pictures are plenty; four would be too busy. Agree that there are too many black elements, if you must keep the mantel could you paint the vents to blend in?

Also -- do you have a green plant you could put in the scene? Green brings things to life ... cheap to try, at any rate.

Love the whitewashed look, it really pretty! However I think you need to fancy up the cabinets- they look like they migrated straight from the kitchen. Maybe someone can mock up something for you.

I want to have a mantel to decorate. I thought the dark brown mantel grounded the room...