>      function {y-f_noise3d(x*2,y,z*2)*0.5+0.3}  // +0.4

I'm wondering why you're basing your function off of the height, when you've
already got a gradient y pattern density. Why don't you just use f_noise3d
without the "y - "?

Also, try adding some turbulence. You may also try changing your second
color_map to something more like

color_map {
      [0.0 rgb 1]
      [0.5 rgb 0.5]
      [0.7 rgb 0]
}

which would create some areas that wouldn't be cloudy.

 - Slime
 [ http://www.slimeland.com/ ]

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