Grey skin WIP - testing in progress 
  - Base coat   Deep Grey  
 - Highlights   Uniform Grey  &   Deep Grey  50/50 mix
 - Refine highlights across raised skin focusing on upper facing areas   Uniform Grey    Deep Grey  using previous 50/50 mix but including 25%   Ash Grey  
 - Glaze pushed into the deepest recesses, using   Deep Grey  then   Uniform Grey  and finally   Ash Grey  slowly reducing the area covered each time
 - Final highlights   Brigade Grey   focusing on upper facing areas