A floor lamp is a good idea. Perhaps something that arcs slightly over the chair, providing a bit of reading light. It doesn't need to go all the way back into the depth of the corner.

I love your room! How about some decorative mirrors?

Greenery?

Big floor plant to bring some color into the room. Overwatering will kill it. Water when you see it drooping a little.

A plant, for sure.

Is there a reason the sofa isn't centered with the fireplace?

A plant is the perfect solution. Anything else runs the risk of making the room look lopsided.

You can use a palm, fiddle leaf fig, or a large leaf philodendron.

A plant might be nice:

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Hi Sarah-

I like the brown throw on your chair. What is it made of and where is it from?

HI -- How about a pedestal with a sculpture on it Just to add an art feature .