Fractals are very difficult to design with, be very careful when using them as they can distract from the flow of a sig very easily!!Another thing is blending, you need to find some way to get the render blended in with everything, it doesnt look like the render is suppose to go with the background. I think your colors are good and your light source is good!! I also thought it was wise not to do text in this one, it would have been very easy to have that as a distraction on this sig!!