A. Turn off Your Flash
Lets start with the obvious ones and work our way back. We’ve all taken shots using a flash in low light situations and have been disappointed by the way it totally destroys any ambient light in a shot. If you want to get the warm glow of candles it’s essential that you switch your flash completely off.
B. Use a Tripod
Stating the obvious again - but shooting by candlelight means you’re shooting with very little light which in turn means you’ll almost certainly be shooting with slower shutter speeds that increase the impact of camera shake on your shots. Make sure your camera is as SECURE and as still as possible during shots by using a tripod and by considering the use of a remote shutter release to take out any vibrations from hitting the shutter.
C. Extra Candles
The biggest big trial, is the lack of light you have to work with. Using more candles will obviously produce more light that gives you a little more flexibility when it comes to shutter speed, ISO and aperture settings.