I really love the shade of red in this! A good idea to bring up the light as the above person said. Sometimes it is simply a matter of monitors that images look bright on one and dark on another. I found that to be true with some of my own. I thought they were bright enough until I put them on disk and viewed them on several other monitors. So, now I brightern my images a little more. Have you tried something with several hues? I assume you are using apophysis.
Never rebuke while you’re still indignant about a fault committed—wait until the next day, or even longer. Then calmly, and with a purer intention, make your reprimand. You’ll gain more by a friendly word than by a three-hour quarrel.
-Josemaria Escriva
Looks good though I can't do this kind of work myself, so it's hard for me to judge. It definitely has a cosmic feel to it. Like solar flares bursting.