For the basement/velvet room, I'd invest in some belah'dian lamps in lieu of the floor sconces. See the lamp above the sofa in the pic below
Also, a bar. This is an old shot from my FC's house.
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It uses a manor desk. The stools in the picture were replaced by riviera stools which match it perfectly imo. We also added the bottles of wine to it since this shot was taken.
also, the diagnostics module table (I think is what it's called) would look swank in that room.
For the classroom, I'd take out some of the desks. You're going to bounce against the item limit fast.