I always wonder why people post bad photos of homes ? Why do the magazines hire photographers. Maybe its because they know people are stumulated visiaully. If they dont like the photos you most likely wont even get the call to show
Make sure you are not looking at a window with your camera it will make everything dark in the room
Hold the camera chest high not eye level seems to get better coverage form floor to ceiling
Get the widest angle you can I use a 12-24 mil lens
What ever you do try not post bad photos on line. Hire someone or get a friend to help.