Well...
I'm still not finished with the bed upgrade, but I wanted to see how the bedroom looks in the default house. So I put it into a copy of the default map to see how it looks. If it looked great in the house, I decided, I'd go ahead and share it with everyone once the bed upgrade is complete.
I used Lyssaria's suggestion of shading certain areas of the walls to give them a more realistic look, and I added some highlighting to that little trim that I added at the bottom of the wall to give it sort of a 3-D look, and I was feeling really proud of myself.
But...
It doesn't fit properly in the room. The shading I have in the corner to make it look like an actual corner isn't aligned with the real corner of the room, but in order to align it, as it is now, I have to move it around in the room and then the floor isn't aligned with the edges of the floor in the default map, and/or the walls stick out slightly in one place and in too far in another place.
Too bad I accidentally didn't keep all the layers. I think I'll have to start all over again.
But that's okay, because it'll give me some more practice, right?