You may need to render just the part of the model which is not working and add some arrows, etc. to the image so I can see it better.
If light is bleeding in from behind the model, then you should use thick overlapping walls rather than single face walls to make sure the light cannot get through.
With the thin walls, light can bleed through at the upper right intersection point.
With the thick walls, the light is obstructed by the multiple faces in each wall.
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Very good but spot lights parallel to the wall in front of the art works would do a better illumination and eliminate glare on the walls.
Add a bit of glossiness to your walls and floors to add more light bounce a result of indirect lighting for over all lighting ambiance. Same goes for your stairs balustrade too.