
I just added a fleur-de-lis pattern to the wallpaper (made it a bit darker, mansions are spooky!), added some "marble" flooring at the edges, and put a skirting board around the room. Just for show, to point out some things you could do to smarten it up a bit.
Also the front door and pillars are a little blurred, and the window should be re-designed to look less like an easter egg. Plus, on top of a patterned wallpaper, you should chock it full of paintings of former owners of the estate, so the player can infer some history. A grandfather clock and suit of armour on the landing would be good as well. Heh, then if it's still not cluttered enough you can remove two of the pillars and site a fireplace there, complete with coal scuttle and curios on the mantel piece. A lot of ideas to work with. Parfait.