Details - HeadDB

Warning: The UUIDs are not real.

Command

/give @p skull 1 3 {display:{Name:"C",Lore:["Skull from HeadDB.org"]},SkullOwner:{Id:"6c8ec6a4-6b51-3be0-8cc1-eb03504bd60a",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvZmZmNWFhYmVhZDZmZWFmYWFlY2Y0NDIyY2RkNzgzN2NiYjM2YjAzYzk4NDFkZDFiMWQyZDNlZGI3ODI1ZTg1MSJ9fX0="}]}}}

API Usage

GET https://headdb.org/api/head/6c8ec6a4-6b51-3be0-8cc1-eb03504bd60a

{
  "name": "C",
  "uuid": "6c8ec6a4-6b51-3be0-8cc1-eb03504bd60a",
  "value": "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvZmZmNWFhYmVhZDZmZWFmYWFlY2Y0NDIyY2RkNzgzN2NiYjM2YjAzYzk4NDFkZDFiMWQyZDNlZGI3ODI1ZTg1MSJ9fX0=",
  "valueDecoded": {
    "textures": {
      "SKIN": {
        "url": "http://textures.minecraft.net/texture/fff5aabead6feafaaecf4422cdd7837cbb36b03c9841dd1b1d2d3edb7825e851"
      }
    }
  },
  "command": "/give @p skull 1 3 {display:{Name:\"C\",Lore:[\"Skull from HeadDB.org\"]},SkullOwner:{Id:\"6c8ec6a4-6b51-3be0-8cc1-eb03504bd60a\",Properties:{textures:[{Value:\"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvZmZmNWFhYmVhZDZmZWFmYWFlY2Y0NDIyY2RkNzgzN2NiYjM2YjAzYzk4NDFkZDFiMWQyZDNlZGI3ODI1ZTg1MSJ9fX0=\"}]}}}"
}

Minecraft Head Database

GET https://headdb.org/api/head/6c8ec6a4-6b51-3be0-8cc1-eb03504bd60a