Don’t do this
Dark valances are not a good design. Detract from the beautiful design and architect of those gorgeous windows. I would have left alone or added long light color panels along outside edges which would have helped with the symmetry of that corner. The left side is off balance to the right. Cabinet out weighs the FP. Bad design IMHO.
What i do not like. Outside mount blinds over windows same as in our house. The clean lines of trim is covered by horizontal veins. Somehow it is not a pretty look. The bottom bar looks dumb hanging above the sill. I note this is due to the window crack. Note how closethe chairs are to rhe blinds. The blinds get bumped and out of sorts. Cornices iare nice. Bad design for this pretty eating nook. I would not have this in my portfolio.
Everything: sofa. Pillows, woven shades, symmetry of lamps behind sofa ..the colors.
Q