Details - HeadDB

Warning: The UUIDs are not real.

Command

/give @p skull 1 3 {display:{Name:"L",Lore:["Skull from HeadDB.org"]},SkullOwner:{Id:"74d4d3e4-18da-3370-bf52-76d4df345ca4",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvMjVhMWUzMzI4YzU3MWFhNDk1ZDljNWY0OTQ4MTVjY2ExNzZjM2FjYjE4NGZlYjVhN2I5Yzk2Y2U4ZTUyZmNlIn19fQ=="}]}}}

API Usage

GET https://headdb.org/api/head/74d4d3e4-18da-3370-bf52-76d4df345ca4

{
  "name": "L",
  "uuid": "74d4d3e4-18da-3370-bf52-76d4df345ca4",
  "value": "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvMjVhMWUzMzI4YzU3MWFhNDk1ZDljNWY0OTQ4MTVjY2ExNzZjM2FjYjE4NGZlYjVhN2I5Yzk2Y2U4ZTUyZmNlIn19fQ==",
  "valueDecoded": {
    "textures": {
      "SKIN": {
        "url": "http://textures.minecraft.net/texture/25a1e3328c571aa495d9c5f494815cca176c3acb184feb5a7b9c96ce8e52fce"
      }
    }
  },
  "command": "/give @p skull 1 3 {display:{Name:\"L\",Lore:[\"Skull from HeadDB.org\"]},SkullOwner:{Id:\"74d4d3e4-18da-3370-bf52-76d4df345ca4\",Properties:{textures:[{Value:\"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvMjVhMWUzMzI4YzU3MWFhNDk1ZDljNWY0OTQ4MTVjY2ExNzZjM2FjYjE4NGZlYjVhN2I5Yzk2Y2U4ZTUyZmNlIn19fQ==\"}]}}}"
}

Minecraft Head Database

GET https://headdb.org/api/head/74d4d3e4-18da-3370-bf52-76d4df345ca4