This is a reshade of knightmareMerc's William Afton skin, the link to the orginal is https://www.minecraftskins.com/skin/16885996/the-man-behind-the-slaughter-/
The shading style was inspired by mochhi's Zombie skin which the link is
https://www.minecraftskins.com/skin/15508502/z-o-m-b-i-e/

/!!!\ THIS IS NOT MY SKIN /!!!\