Thank you, sjb007.
I've spent the last 2 hours working on getting the office "fixed", and I think that I might have it.
I've taken two distinct pictures; the first with the door to the hallway behind, and second from sitting in the armchair looking up. As you can see I've added roof windows that I downloaded from 3D Warehouse, as well as a light over the armchair for those late night reading sessions.
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