You have a beautiful room and envious expanse of windows. Don't waste your money on ready made curtain panels. they will just look skimpy and sloppy. If you want curtains than have them custom made (3 times fullness of the overall width of the windows), Center opening which means the stack up on each end will cover part of the glass doors at each end. Opt for a semi sheer linen. But - here is another option to consider: Paint the doors only (not the casings a charcoal gray or black and if you need privacy mount individual light weight grass weave shades on the doors. Paint any other interior doors the same dark gray or black in a satin or semi gloss finish. If you don't need privacy or sun control then I would not bother with any window coverings.

Add contemporary styled swing arm lamps on each side of the picture over the sectional and a floor lamp in the right hand corner or a table lamp between the two chairs. This will give you more intimate lighting than over head ceiling lights and the room will feel warmer. When you just have overhead lights it makes the room feel cold. Add an upholstered bench in front of the fireplace.