Mindflayers have always been one of my favorite creatures roaming the underdark back in my campaigning days.
Supreme leader snoke base
Drilled holes in the face - set thin wire- sculpted octopus face over existing head
Drilled a hole in the mouth, sculpted, a beak and its place under the tentacles. Hard to see.
Soaked his robe in dye
Red ribbon as the runner
Green stuff sculpted spiderweb armor
Small craft gems