Details - HeadDB

Warning: The UUIDs are not real.

Command

/give @p skull 1 3 {display:{Name:"Z",Lore:["Skull from HeadDB.org"]},SkullOwner:{Id:"cf80bc82-5652-30f6-9dcf-83371307cdbf",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvNGU5MTIwMGRmMWNhZTUxYWNjMDcxZjg1YzdmN2Y1Yjg0NDlkMzliYjMyZjM2M2IwYWE1MWRiYzg1ZDEzM2UifX19"}]}}}

API Usage

GET https://headdb.org/api/head/cf80bc82-5652-30f6-9dcf-83371307cdbf

{
  "name": "Z",
  "uuid": "cf80bc82-5652-30f6-9dcf-83371307cdbf",
  "value": "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvNGU5MTIwMGRmMWNhZTUxYWNjMDcxZjg1YzdmN2Y1Yjg0NDlkMzliYjMyZjM2M2IwYWE1MWRiYzg1ZDEzM2UifX19",
  "valueDecoded": {
    "textures": {
      "SKIN": {
        "url": "http://textures.minecraft.net/texture/4e91200df1cae51acc071f85c7f7f5b8449d39bb32f363b0aa51dbc85d133e"
      }
    }
  },
  "command": "/give @p skull 1 3 {display:{Name:\"Z\",Lore:[\"Skull from HeadDB.org\"]},SkullOwner:{Id:\"cf80bc82-5652-30f6-9dcf-83371307cdbf\",Properties:{textures:[{Value:\"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvNGU5MTIwMGRmMWNhZTUxYWNjMDcxZjg1YzdmN2Y1Yjg0NDlkMzliYjMyZjM2M2IwYWE1MWRiYzg1ZDEzM2UifX19\"}]}}}"
}

Minecraft Head Database

GET https://headdb.org/api/head/cf80bc82-5652-30f6-9dcf-83371307cdbf