I (Deanna) edit thousands of photos. I have to admit that I like a challenge when it comes to making a photo look good. There are some, however, that I can't do much for. Probably the most important factor for a great photo happens before it gets loaded onto the computer. Whether or not you have a wide angle lens on your camera will make a huge difference. Any easy way to tell if your photo shows enough, is to see if it shows three walls of the room.
Check out these two photos. They're both taken from the same position, one with a wide angle lens (10-20mm lens set at 10mm), one without (18-55mm lens set at 24mm, still a bit of a wide angle). Remember, furniture adds perspective to a real estate photo, but it should not be the highlight of the scene. Buyers will want to see the size of windows, cathedral ceilings, doorway arches, etc. The only way to get an overall feel of the whole room is to... well... get the whole room in the photo.