For the beard, the following texture is used.

This is more complex to get right. While I am satisfied with the 
texture, the beard mesh need more work I guess.

material {
   texture {
     uv_mapping
     pigment {
       gradient x
       pigment_map {
         [0.00 srgb <  0,   0,   0>/255 transmit 0.8]
         [0.10 srgb <171,  77,  14>/255 transmit 0.7]
         [0.50 srgb <  0,   0,   0>/255 transmit 0.5]
         [0.60 srgb <171,  77,  14>/255 transmit 0.0]
       }
       scale <1, 1, 1>
       warp {turbulence <0.0, 0.3, 0.3>}
     }
     finish {
       specular 0.2
       roughness 0.005
       diffuse 0.8
     }
   }
}


Thomas

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