> UPDATE
> 
> See the three attached images.
> The first image shows, how the scene is right now.
> The second (photoshopped) image shows, how I want it.
> The third image shows the horizon features (not colors) I want.
> 
> The ground fog should not reach so high. It should reach up to short
> above the clouds (Y=1.0)  only and then be faded away at height Y=2.0.
> 
> Also, the clouds seem to have a brighter edge at the horizon. Thus I
> wonder, if a media item can take that away and create an "atmospheric
> layer" as seen on image 3 in pink (between the blue sky and the lilac
> clouds).
> 
> See below the current scene code. Please feel free to make changes, to
> demonstrate to me how to get those features. Big thanks.

First : Remove all fogs.
Next : Also remove that emissive media.
Those two are hiding the shadow.

Try the following :

cylinder
{
  < 0.0, -0.5, 0.0 > < 0.0, 1.0, 0.0 > 10.0
  pigment{ rgbt < 0.20784,  0.19216,  0.25098, 1.0 > }
  hollow
  interior
  {
   media
   {
    absorption < 0.0, 0.0, 0.5 >
//Also try without the above
    scattering
    {
     3, < 1.0, 1.0, 1.0 >
     extinction  1.0
    }
    density
    {
     gradient < 1.0, 0.25, 0.5 >  // controls the cloud formation
     turbulence 0.5
     frequency 5
     color_map
     {
      [ 0.0 rgb 0.0 ]//border
      [ 0.5 rgb <0.2, 0.2, 0.25> ]
      [ 1.0 rgb <2, 2, 3> ]//center
//This makes the media blueish.
//You are not limited to the 0..1 range.
     } // end color_map
    } // end of density
   } // end of media ----
  } // end of interior
  translate < 0.0, 1.0, 0.0 >
  scale < 5.0, 1.5, 5.0 >
}



cylinder
{
  < 0.0, 0.0, 0.0 > < 0.0, 8.0, 0.0 > 0.25
  texture { T01 }
  texture { T_Copper_1A }
}

The reason you need to remove the emissive media : Emissive media goal 
is to simulate GLOWING gaz that actually emit light by itself, like a 
flame or some plasma.
Clouds only scatter light, they don't emit any.

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