Prime model with   Matt White   
Wash completely with 1:1   Nuln Oil  &   Agrax Earthshade  with a few drops of   Speedpaint Medium  
Paint the brass details with   Tainted Gold  
Paint the accents with   Royal Blue  
Paint the gun case with   Grim Black  and then paint the silver details with   Broadsword Silver  
Finally add iconography with   Evil Sunz Scarlet  &   Wild Green