As you can see, there seems to be an issue, here:
Half the frame looks black and I'm pretty sure part of the painting looks darker than it should do, as well.
Saw it in the preview, but just assumed it would be OK in person, but turns out it wasn't.
Have also seen similar kinds of issues on parts of the walls and on various other things in Western Skyrim (like the stones on the walls of bridges etc.).
View form the Proudspire Manor balcony.
This problem extends to the new inn room, as well:
Interior of the Snowmelt Suite.