You included several photos but I cannot picture the layout. Photo of entire fireplace wall might be helpful. What do you plan to use this space for?

Four chairs around a coffee table, no built ins, and artwork rather than a mirror over the fireplace.

We don't see to the left of the fireplace, but if there is another window, you might also consider half tables and plant material below each one.

Sorry I posted 2 of the same photo. Left of fireplace is a mirror of the right. A window and small space between fireplace and wall. Not sure why the photos came out sideways.

I appreciate the feedback. Was already thinking plants, like the reinforcement. Space is a second sitting/living room. Will not be used often. Will have a fire occasionally or place to talk when friends are over.

I would not bother with built-ins or curtains. I like the room below. photo 1

I'd have only one chandelier - something that related to the coffee table, probably wood. photo 2

Logs in a basket. photo 3

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