The Rat King (Fan art) 1 Preparing
The Rat King (Fan art) - 2 ZSpheres
The Rat King (Fan art) - 3 Sculpting part 1
The Rat King (Fan art) - 4 Sculpting part 2
The Rat King (Fan art) - 5 Sculpting Skull
The Rat King (Fan art) - 6 Final compose
There is partially recorded process of Rat King (Fan Art) creation. Hope it can be helpful.