Roll arm chairs will add bulk to a small room where the sofa and coffee table are already bulky. I'd go with upholstered chairs with cleaner lines. Like this, perhaps:

Breathing Room · More Info

I’d go with less bulky chairs also and rug will pull it all together.

Congratulations on your beautiful new sofa! I prefer to see a Chesterfield, particularly if it's leather, paired with chairs of similar heft and think the roll arm chairs you're considering would be a good choice.

Couple of pretty rooms here:

I was coming here to post that second picture Ida posted! Ha!

Totally agree ... I took a look at your idea books and see some lovely traditional styles. I like your idea of chairs.

Ida has a beautiful leather Chesterfield with a wonderful wingback chair that fits it so well. :)

Only one photo? The sofa is commanding…how much floor space do you have for a coffee table and chairs?

Paint or wallpaper the walls a darker color. Sofa needs a stronger back drop.

Commanding? Bulky? Good grief, y’all act like it’s the sofa version of The Great Wall of China or something. 😄

It’s not that extreme. Yes, in a sea of light-weight MCM and the ubiquitous clean lines, it might seem imposing, but it’s really not.

Chairs for me are about function, first and foremost. Is it better if they swivel? Are any needed for reading? Are they there for conversation — with how many people sitting where? Will they be better with ottomans? How long will people typically be sitting in them?

I do think a Chesterfield bosses the room so I would want a chair (or chairs) that talks back

Roll Arm Chair With Turned Legs, Sheepskin Natural · More Info

(this one is really confrontational)

Woodrow Box Chair, Premium Fabric Upholstery, Neptune Seat, Walnut Base · More Info

Benzara Fabric Upholstered Wooden Chair with Floral Embroidery, Gray and Brown · More Info

Looks like the built-in and TV are ruining the natural light that should come through that window, and your mirror is reflecting the ceiling instead of something interesting or beautiful. Consider removing them. floating the Chesterfield perp to the FP, facing the window and view, and a pair of swivel chairs that can turn to watch TV, which goes opposite the FP.

Have you picked your rug yet?

If you are painting the built in, could you also update it a bit to better fit with the room? You could take the curved arches off and just add a straight edge. Maybe update the louvered doors to raised panel doors like the others so all are the same. Why is there a curtain behind the TV? Take that away, it's distracting. You could add a piece of moulding to the ceiling at the top to match the rest of your moulding in the room and truly make it look built in.
Good luck!

Is the room for family TV watching only or is it also for entertaining?

If it is for the family and the TV, I would get the sheepskin chair I posted earlier, and I would get a big square or round tufted ottoman for a coffee table/foot rest.

If it is also used for entertaining, I would pick a chair with some Hollywood Regency glam to it, or at a minimum velvet in a rich color

Luke Glam and Luxe Light Blue Velvet Fabric Upholstered Gold Armchair · More Info

Jennifer Taylor Home Alana Lawson Chair Olive Green · More Info

and a glass or faux-stone coffee table with a heavy-ish gold or silver toned base.

In addition to painting the media unit (and removing the curtain behind the TV) I suggest taking everything off the mantle except the candlesticks. There is a lot of dramatic fixed things in the room now, so having that space above the mantle as a breathing space is fine. The decorative fireplace and moulding is enough decoration for that side of the room. Maybe eventually you’ll spot a perfect black and white drawing for that space, framed in white.

This would make a nice emergency seat or a nice side table for a chair in your room, depending on the chair. It needs a tray on top to make it useful as a place to set down a glass of liquid.

Garden Seat 19 H, Architectural Small Pedestals -18"H · More Info

Just seeing the picture of the entire room — the built-ins are going to look great painted. Do you have a new rug picked out already?

It’s going to be a really cozy, comfortable, and pretty room.

Thanks! I hope so!

I don’t have a rug yet but open to suggestions! I was thinking these chairs because the RH ones are a little out of my price range :(

Actually your rug isn't so bad, is it blue or grey? I think blue, I would add some blue pillows to tie the rug in.
But if you are wanting a new rug, which colors are you drawn to? Reds? greens? Blues?

does the wayfair chair come in color? it would be great in an accent. I think the white is too stark against your sofa.

You didn't ask but I don't think I would cover that pretty sofa back with pillows.

Thank you! I will take whatever design advice I can get! I currently have a bunch of cream winter pillows from my old couch but need to upgrade to spring!

The Wayfair chair comes in a bunch of colors! I was thinking closer to one above from RH.