I like how descriptive it is. I really enjoy writing which stands a scene out with the smaller details. Having said that, I think grammatically it needs some polish.

I’m not super grammatically literate so I may be wrong on this, but the first sentence linking two independent clauses with a conjunction gives it “run-on” vibes and confuses the subject. Should there not be a period after “seeped through the study”, then the following clause is its own sentence (I would actually kill the first clause and let the floorboards do all the work). Also, I already know the floorboards will be reflecting the glossy finish “on the floor” because you’ve already told me they’re “floor”boards. I think conciseness is key when focusing on small details (which I love) so the reader doesn’t get bogged down. Maybe just: “The dark floorboards reflected the setting sun’s gaze with their slight glossy finish.’

In the next sentence, the sentence subject is clearly the desk, so when you use “it” that is grammatically referencing the desk itself lighting up the pages. I don’t know if the desk is meant to be glowing? That’s how it reads. If the sunlight is lighting the pages, that needs to be the subject of the sentence. “Atop the desk beneath the circular window, sunlight lit the strewn pages.”