You’ll get more responses if you come back and post a pic when you can get one.

@Ольга found a few pics that hopefully give an ide

We have the same setup in rooms on the first and second floor: same shape and setup of windows and sconces. The nook pictured with red curtains is on the first floor and on the second floor it's the same except the middle window is half the height and doesn't open. Picture with blue curtains is one of the second floor windows. What you see is the previous owner's solution to curtains in these spaces.

I think the filigree is not original to the house. I suggest you remove it.

Ideas:

That text is too blurry but it refers to spindle work transom

Because of the wainscoting and the filigree, I would look for something simple on the windows. The roller shades as @elcieg suggests or an inside mount roman shade. I would have them be the same color as the trim.

@jck910 are you thinking a flat Roman shade? Is there such a thing as a curved one

Also, on the second floor there is no wainscotting or filigree if that affects the choice up there

Wow! I have been in a lot of Victorians and never seen that filigree. Thanks for sharing the photos.

Roman shades would be perfect.

I think you would have to contact a custom made window treatment business to find out if they can make a curved one. If not it may have to hung on the wood work

You might be able to have someone construct a Roman shade for each window and have each of them attached to a bendable strip of wood so that it can be attached to the curved upper trim of your windows. GORGEOUS windows, by the way!

The most versatile window covering for an inside mount installation are bottom-up top-down blinds and shades. You can move them to any part of your window depending on light or privacy. Absolutely no need to fully close your shades for privacy - just partially on the bottom. With only 1 inch in depth, they install perfectly to shallow trims and windows.

Again, a treatment that will follow the beautiful curve of the GLASS and window frame, is what would look best. Most of the suggestions posted here seem to be ignoring the fact that the actual windows, themselves, are made of bowed glass. They are stunning! Too bad they have to be covered…at all!

Perhaps something like this would work for an interior hung curtain?

Far as whether we need curtains, on the second floor it's the master bedroom so I do want to block the light as well as have some privacy. On the first floor it doesn't matter as much but it is nice to have the option of privacy

If we did interior hung curtains on a curved rod would they just go to the s i l l? What if we did a big curved rod and hung long curtains but just didn't push them in front of the sconces, I wonder if that would look weird

Is there a reason you don't like the set up as is, just changing fabric? Such a pretty room.

Mind it too much but I thought maybe we could do better. Everything I've read about window treatments recommends having the curtains go outside the window and down to the floor and I was also curious if we could find a way to respect the curve of the window