This is a very elegant and beautiful fractal. It has the appearance of an intricately carved sphere, revealing a colorful interior. The positive shapes are sinuous yet pointy, and attractive themselves, but their real contribution to this piece is to define interesting negative shapes. Those shapes are then divided into smaller shapes, which are divided into yet smaller shapes, at which point the ever diminishing shapes become a nice texture. The overall effect works very well, and is a great example of how fractals work.
The colors are very well controlled. I especially like the way the yellowish color from the top dips down into the bottom at the center; this ties top and bottom together and helps balance the overall piece. The hot spot in the center is mildly distracting, but not overbearing. The bright spot near the bottom looks like a specular highlight, and is a great touch.
My only suggestion for improving the fractal itself would be to make the white shapes just a bit narrower. Not having access to your parameters, I don't know if this would be easy or even possible! But I think it would sharpen the 3-D effect a bit.
I have a couple of suggestions for the fractal's setting. First, the 3:2 aspect ratio seems a bit wide for the circular fractal. Narrowing it to 5:4, or even to a square (1:1) would suit the image better. Second, the stark white background detracts from inner glow of the Sphere of Light; a dark gray background would show it off better. Note the fractal itself needs the white background; I'm talking about the area outside the fractal. This can't be done in Apophysis, but is easily done in most graphic editors. While you're there, a tiny bit of sharpening would help the fractal (just enough to counter the anti-aliasing done by the render process).
Even without any changes, this is a great fractal. Its intriguing shapes invite exploration, and the appealing colors make it a pleasure to experience.