Skill issue, Warhammer painters are all over it:
http://razzaminipainting.blogspot.com/2016/07/non-metallic-m...
http://razzaminipainting.blogspot.com/2016/07/non-metallic-m...
Here’s the link without the bullshit: http://razzaminipainting.blogspot.com/2016/07/non-metallic-m...