To continue with test renderings, here's a 1920x1080 view of the tail end of the
power 8, iteration 7 mandelbulb.  [WARNING: 3MB]

To fill the shadows, I've found using radiosity renders quicker than adding even
a tiny area light.

Also, recursive anti-aliasing seems to make the best images.  When using lower
radiosity for darker shadows, the settings +A0.5 +AM2 +R2 -J work well.

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