Head is the on of the main thing in this plugin. Head is the rotating thing what player see.
You can set to head lot of thing.. Items, Blocks, Skins, ResourcePacks models and more.
You can use any item or block you want.
Items like diamond, emerald, etc don't looks good
example:
head:
type: ITEM
value: 'DIAMOND(amount=1)'
You can use per player head or one player skin for all
You can use placeholders from PlaceholderAPI
Material:
1.8-1.12.x - SKULL_ITEM
1.13+ - PLAYER_HEAD