Show the room IMO not every space needs filling in fact the empty spaces are sometimes a great relief

As Patricia said, it's pretty difficult to make any recommendations without any context on the rest of the space. In some cases it's fine to have an empty corner. Can you share broader picture or more pictures of the rest of the space? We don't even know what room this is.

I have know idea what your room looks like, but could you use a floor lamp in that corner?

Looks like a matching drape on the drapeless window would take care of filling that corner but since my super hero powers of being able to look into your house via my screen is not working today, I guess the only way we'll be able to properly answer is by you showing us more of the room...

Well. Yikes. Sorry. Was just looking for general ideas. The furniture is changing but there will still be an oversized chair where the current one is sitting.

I agree with @tedbixby1981.....Drapes on your other windows will fill that area. It will also give the room a much more finished look.

I would not add a blanket ladder.

If you want a general answer then put a corner bookcase there. If you want more thoughtful answers that take into account the whole room and the layout then we need to ask you questions. Let us know what you want. :)

I would put plant there or nothing. Not actually a lot of room.

Nice space. Like having lots of widows in a room.

Like the "Love" art and the picnic basket. Would probably put the art in a bedroom or on a wall in a hall leading to the bedrooms.

If the "empty" corner disturbs you and if there is enough sunlight, you could add a living plant there.

Do consider shortening the drapes and/or raising the rod so the bottom of the drapes hover at barely above floor level but do not touch it (because I personally loathe that sloppy drag floor look and, hopefully, that fad has past ). Your drapes look too nice to have them drag on the floor like that. Also, the sloppy "look at me" drapes on the one window draws attention to the fact that the other window has no matching drapes or any fabric window treatment at all.

If your budget will not permit you to dress all the windows in the room with the same drapes, You might consider adding relatively inexpensive white sheer curtains to all of them, keeping the matching pull shades as well.

You could display the matching baskets by adding a flower pot with drain tray that fits/hides in each of them rather than empty and/or collecting clutter.

Are you DIY inclined? Consider creating a pair of very basic shallow wood benches -- one for beneath each of the two window (left of the art in the original pic - behind the large chair). Make each of them the same width as the window. Leave the space beneath them open so you can have air flow for any baseboard vents and/or to set your basket collection there -- putting any extra bracing between the two end high up against the seat. Then you could set a plant in front of each window atop the seat. You choose the size -- width and depth -- to fit your available space. If you think you might ever want to move the benches outside to your patio for extra seating, make them out of treated rounded edged deck boards and treated 2"x4" lumber and paint or stain them to suit your taste.

https://www.wayfair.com/furniture/pdp/loon-peak-arocho-solid-wood-shelves-storage-bench-lopk6003.html

Or you could use a pair of cabinets.

https://www.wayfair.com/Ebern-Designs--Tidworth-Storage-Bench-X111875538-L256-K~W000764427.html?refid=GX434287255136-W000764427_1709416808&device=c&ptid=902916063546&network=g&targetid=aud-354999624471:pla-902916063546&channel=GooglePLA&ireid=76192071&fdid=1817&PiID%5B%5D=1709416808&gclid=EAIaIQobChMIgbqat77J7gIVxeDICh3mPAcaEAQYAiABEgIb5fD_BwE

Matching drapes, absolutely. Hopefully matching is easy to find and not too costly.

Add your baskets with plants.

I would do a plant stand there with plant. Nothing too bulky or tall. Something light and airy:

ETA: Something like this could be painted, or stained a darker color, too. It would look great with a fern or other very leafy plant.

It's a nice room with lots of lovely windows. I don't think you need anything in the corner. It's giving the rest of the furniture room to breathe. You could put some art on the wall if you like. Or if it still feels too empty for you, you could put a plant there on a plant stand or a small table.

Drapes on all 4 windows. They don't need to match. Agree that the floor-pooling look is dated.

Be sure that you have adequate stack back on your drapes, i.e. that when the drapes are opened the glass is completely exposed. You may need longer drapery rods.

Nothing in that corner.

Drapes on all the windows and NOTHING in the corner!!

Cat tree. No cat? Put it there and they will come. :-)

They'll come to scratch up the corner of your sofa, but the cat tree will remain untouched. 😸

Thank you all. I think I will definitely be adding the matching drapes after your comments ... my original thought was to use a natural/wood type shade. I liked the look of the drapes on the floor. I guess I'll have to live with that as I can't raise them and can't afford to buy more at this point. My husband will kill me. LOL. I guess I can always hem them at some point if I decide.

Iron-on hem tape is so easy to use.