Details - HeadDB

Warning: The UUIDs are not real.

Command

/give @p skull 1 3 {display:{Name:"R",Lore:["Skull from HeadDB.org"]},SkullOwner:{Id:"ad88a59b-1fa8-3189-950d-9a3d31dab5e7",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvYzAzYTFjZDU4M2NiYmZmZGUwOGY5NDNlNTZhYzNlM2FmYWZlY2FlZGU4MzQyMjFhODFlNmRiNmM2NDY2N2Y3ZCJ9fX0="}]}}}

API Usage

GET https://headdb.org/api/head/ad88a59b-1fa8-3189-950d-9a3d31dab5e7

{
  "name": "R",
  "uuid": "ad88a59b-1fa8-3189-950d-9a3d31dab5e7",
  "value": "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvYzAzYTFjZDU4M2NiYmZmZGUwOGY5NDNlNTZhYzNlM2FmYWZlY2FlZGU4MzQyMjFhODFlNmRiNmM2NDY2N2Y3ZCJ9fX0=",
  "valueDecoded": {
    "textures": {
      "SKIN": {
        "url": "http://textures.minecraft.net/texture/c03a1cd583cbbffde08f943e56ac3e3afafecaede834221a81e6db6c64667f7d"
      }
    }
  },
  "command": "/give @p skull 1 3 {display:{Name:\"R\",Lore:[\"Skull from HeadDB.org\"]},SkullOwner:{Id:\"ad88a59b-1fa8-3189-950d-9a3d31dab5e7\",Properties:{textures:[{Value:\"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvYzAzYTFjZDU4M2NiYmZmZGUwOGY5NDNlNTZhYzNlM2FmYWZlY2FlZGU4MzQyMjFhODFlNmRiNmM2NDY2N2Y3ZCJ9fX0=\"}]}}}"
}

Minecraft Head Database

GET https://headdb.org/api/head/ad88a59b-1fa8-3189-950d-9a3d31dab5e7