Try putting the largest piece on the biggest wall. That would be the tall cabinet moved and centered on the back wall where the sconces are.

Your heavy furniture is all sort of pushed to the back of the room and made to fit in areas that are too small to give it enough space to shine.

If you look at this picture there is a line of lamps, sconces and chandeliers that go around the room. That small lamp on the top of the chest could be removed.

Instead of tall candles and tall flowers on the buffet table add a short bowl. That would also be a good place for a mirror 2/3 to 3/4 the width of what it's hanging above. Lately, I've been drawn to these antiqued mirrors. They diffuse the light and give a softer look.