1: Invest in a camera with a large wide-angle. The best and most affordable option is a cheap SLR with an extra super wide-angle lens. Lens focal length should begin at a maximum of 12 if you want to get the whole room. The focal length is listed in the name, such as "Sigma 10-20 mm"
2: A flash that you can target up is always good. The built-in flash always shoot straight. There are additional flashes that can buy the camera that can be directed upwards. The light then bounces on the white ceiling and spread across the room in a good way.
3: When you're shooting, you should point the camera horizontally straight. Aim it too much upward or downward bend wide-angle lens picture abnormally. Normally, this means that you have to shoot kneeling.