Are you in love with the firescreen? It seems like it grabs too much attention. Too ornate for the sleek fireplace.

Some objects of varying sizes would be more interesting for the hearth. Everything there now is basically the same height.

I would suggest a simple espresso beam as it would be a warm accent against your gray walls and would finish off the top.

The mantle is so short. I would like it better if it went clear across, was a piece of reclaimed darker wood & wrapped around the sides. I like the other accessories except to lower the mirror to rest on the mantle & vary the heights of the 3 pieces of the other items as they are all much the same height.

With tile floors and tile on the fireplace maybe something other than wood might be more in keeping with the overall look of your room. This is stone.

I think the color and style are good.

I would go with the darker color. Your fireplace is beautiful. I love the screen!