Reddit mentions of NATSEN 52" LED Semi Flush Mount Ceiling Fan Lighting with Remote Control, Two Red Curled Blades and Frosted Glass Cover (Gold Mounting Base) for Bedroom, Dining Room and Living Room

Ok, from what I can see in the photos, you've got a space that has very clean geometric lines; without more traditional trim wood and proportions, trad fabrics and furnishings are always going to feel mismatched. The rectangular window won't take a drapery without making everything seem stumpy and disconnected.

Stay with me, I know this isn't everyone's cup of tea, but the space seems to be just the right thing for a sort of 70s supergraphic--if you embrace the weirdness and do some sort of graduated striping along that wall, it could be fantastic. Not right up against the corner, but something that would then overlap onto the window void, continuing up the wall and interacting with that porthole? Then get a custom roller shade on the window that continues the stripe.

Here's links to the general idea, these examples are a bit out there--
https://www.flickr.com/photos/only-girl/4311724600/in/set-72157623176562505

http://media-cache-ec0.pinimg.com/736x/9d/77/11/9d7711657a2954fa31fd7b4581871ca0.jpg

https://s-media-cache-ak0.pinimg.com/originals/6b/5e/6a/6b5e6a33554ad200ddc64eb2731bdce7.jpg

I'm sure there's other places, but a quick Google got me this custom-printed shade place
https://www.blindsgalore.com/m/expressions

And while you're up and about with a ladder, that ceiling fan 0_o
https://www.amazon.com/NATSEN-Flush-Mount-Ceiling-Blades/dp/B01MRLU05T

Hope that helps!