How does one go about skinning monsters?

this is probably really easy I
this is probably really easy I've been hunting skins down for other reasons when it hit me that there's some impressive skins for Unreal1 monsters in t…

Humbaba guardian of the cedar forests big monster tree skin

Go Ho Liquid Latex SFX Makeup(1 oz),Halloween Monster Zombie

Material Skin Monster 51 Seamless PBR Texture Texture

In the Skin of a Monster by Kathryn Barker

John Kiritsis - Skin Monster

What monster from a TV show or movie legitimately makes your skin

Save 30% on My Singing Monsters - Perplexplore Skin Pack on Steam

Monsters inc Minecraft Skins

Sacred Skin Tattoo

Buy of Monsters & Men Beneath the Skin (Clear with White and Black

He Who Fights With Monsters - Nietzsche iPad Case & Skin for Sale

My Singing Monsters - Season of Love Skin Pack on Steam