Wow what a beautiful space! Looks like you have ample room to add 2 smaller profile chairs in that window area. Try the ones you have opposite your sofa for the scale. You may even like those at the windows instead. Your plants will still fit, and you can keep that little drink/ plant table too. Would you consider a chaise in front of the fireplace rather than the chairs? A narrow one that’s more of a padded bench than a chaise...

That's a beautiful room. I'd use a low upholstered bench over by the windows so you don't impede the view and light. Or two shorter bench seats that can be pulled up as needed when you have people over.

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The window would also be a great spot for a reading chair and ottoman. The ottoman with or without the chair could be pulled up for extra seating when needed.

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AMAZING space!! BEAUTIFUL BEAUTIFUL!!!!
The detail here is incredible. Love all the detailing here.
Ok. To the point. I agree with the above and would definitely look into a bench there! Low profile. White or cream material. Antiqued looking legs. Cream throw across it. Some pillows. Voilá :)

I would put the two chairs you have across from the sofa there and then get upholstered chairs for the sofas area.

Gorgeous space!