Bright enough? I brightened it and increased the clarity as best I could without completely washing out the fire (when creating the picture, I was thinking about making a completely dark background to make the fire stand out, but in my mind's eye, it looked too dark). Are you coloring it digitally and enhancing the fire perhaps? Post pictures of it please, if you do. I was thinking about going over it on my graphic art program for the sole reason that fire is so hard to get just right in pencil, and on a white background.
Let me know if you still need the picture enhanced.