Lovely work - like the classic grey too. I thought I noticed a deviance in the ceiling, the picture with the two towers you can see it left side by the light fitting. Thing is... I'd have said the eye is drawn MORE to a gap deviation than a fillet deviation if it's plain with no detailing.
Other possibility could have been to add some led strips behind the cornicing on the sofa section to add a bit of ambient for watching TV etc. With that area having a sofa I might have thought about a couple of small shelves either side for a beverage of choice.