Large subject like people receive an orange cast or glow that softens the features, especially facial features. Since blemishes are mostly composed of red and orange tones, they blend in with the rest of the face really well under candle light - maybe that's why candle light dinners are supposed to be romantic? It makes everyone look good.
For smaller subjects, candle light can cast a nice soft, dim light that highlights anything red to yellow and darkens anything green to purple, resulting in a selectively bright image. Follow these steps and give it a try!
Step 1: Eliminate Ambient Light
Step 2: Use Frosted Glass As a Diffuser
Step 3: Get the Candle Close
Step 4: Use a Tripod + HUGE Aperture
This is a low-light situation, so open your aperture as wide as you can. If you're using a prime lens, even better - most prime lenses around f/1.8 allow up to four times as much light through as a typical zoom lens.
And there you have it - you should be able to produce soft, orange-y images with a nice glow and warm tones - and all it took was a candle!
Learn more cool techniques at my website, www.picturelikethis.com if you liked this one!