A different approach :

Only one point_light with a negative color at camera position, and an 
ambient texture.

camera {
   location  <0.0, 0, -10.0>
   direction 1.5*z
   right     x*image_width/image_height
   look_at   <0.0, 0.0,  0.0>
}
light_source {
   <0, 0, -15> // same as cam, to eliminate the side/parallax effect
   color rgb -2 // megative value for dark side, greater than 1 for good 
contrast ;)
   shadowless
}
// the excellent texture, slightly modified
#local Surface = texture {
  pigment { color rgb <0.804, 0.82, 0.85> }
  normal { agate scale 0.1 }
  finish { ambient 2 diffuse 1 }  // ambient greater than 1 for good 
contrast
}

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