Can you send a pic further back maybe?

Also art will probably be your best option if seating and shelving won’t. Maybe a mirror? A big painting

Artwork or a large quilt or tapestry on that wall is all you need there.

What is on the other side of this bump out?

We’re JUST finishing remodeling so don’t mind the random furniture, but on the left is a wall to the master bedroom and to the right is a white wall where we thought about putting some artwork to see as you go up the stairs. I think a mirror could work 🤔

Right BEHIND that green wall is the roof of the apartment building. Can’t put a window in because it changes the facade of the architecture and we’d have to have the entire apartment building re-studied get permission to put in a window

Here’s a shot from further back, those sliding glass doors are to an enclosed Florida room

It's hard to tell from these pictures what is going on , especially between the Florida room & the white rail

White rail is because that’s the stairs coming up , some commenters asked for a picture from further back so I had to go into the Florida room to try and get a better angle. Really just want to know what to do with the space under the green wall which is about 2 feet wide by 8-9 feet long

large piece of art or tapestry, square.

First paint it a more interesting color than dark green. What color? Find a large piece of art and pick a color from it for the wall. Check www.Art.com or www.great big canvas.com for large art works.