I think the background is a great cotrast to the flame and makes it stand out even more, so I have to disagree with the first two comments. You captured a great shape to the flame as well, thanks for sharing.
Gareth
I like how you left some space on the right side... it helps to show the movement of the flame from left to right. I feel like there is a little too much space though, possibly remove 1/3 or 1/2 the distance between the flame and the right border. overall though, great capture! keep up the great work!