I really like this!
I would eliminate or narrow the skylight if you want to make this more claustrophobic.
From the angle it’s hard to tell but is the chair close to or touching the ceiling? If it is, showing that it was it might help.
I get the sense of impending doom. If that’s what you’re going for then may be the ball could be tethered to the wall with an old rope or rusty chain, that has a lot of tension on it, so that it looks like it could break and swing into the chair at any moment.
I really like it as it is though.





