Because of the style of the room and not having a bank of windows, I would add wide stained trim to the windows and possibly an arched element on top. For the upper windows, I would have them tinted to cut done on the glare and heat. You could also look at remote controlled solar shades. If you need privacy on the lower windows, I would go with a stained wood blind that matched the window trim. Or do all three windows with wood blinds.

Thanks Nancy, that's pointing me to a third solution I hadn't thought of. I love the arched element idea, to echo the other arches in the home. One thing I'm not sure about is that the windows already have a 2-3 inch wide white frame on all sides (this is the plastic frame that is part of the windows, not trim. I'm not sure whether wood trim would look good surrounding these wide white frames? What do you think?

The trim would go on the wall itself, not inside the window cavity, right? I guess that's the only way anyway.

The glare in the photo is from my photo editing. We love the light coming through, and in fact have been going through the house painstakingly removing the UV film the previous owners have put in from every single window. I don't understand why people would make/buy a bright house and then go and put film on all the windows.

Anyway, we got new windows through most of the house, and they already have low-E glass. So most of the visible light goes through, which is fantastic, but most of the UV light is reflected to protect us (and the furniture and carpets).

Quick run by post....

Like the trim and arch idea.

I think it would also work to add curtains to just the bottom window.

They put the film on because the uv wrecks such havoc on furniture and floors. I love light but like anything not all windows are created equal I hope your low e ones work because ours didn’t do the job they were supposed to!

I wouldn't change those windows and love their current simplicity which really lends a zen feel to the space. Adding trim or an arch would detract from that, IMO. Those windows are meant to be without trim, making something of a contemporary sculptural feature in the room. They're lovely just as they are.

I'd add a top down shade only if needed for privacy and keep the whole look clean and simple as it was intended to be.

So yes, I was thinking trim just on the outside edge attached to the wall. You may want to consider putting the wood on the inside of the window if you where to replace the windows sills with wood ones.