- Prime with   Grey  
 - The inner parts and belly with   Dead Flesh  1:1   Cold Grey  
 - The membranes with   Red  1:1   Black 
 - Outer skin   Magic Blue  1:1   Cold Grey  
 - After it is all dray I did a wash with   Glaze Medium  8:1   Black Green  :1   Magic Blue  
 - A second wash in the red and light parts with   Agrax Earthshade  
 - Varnish with   Polyurethane Gloss Varnish  
 
Ps.: when painting the skin I didn't try to be precise so I let the colors to overlap as well as I did a second pass in some areas and just one in others. The idea is to create a tone variation that exists with fishes.