Details - HeadDB

Warning: The UUIDs are not real.

Command

/give @p skull 1 3 {display:{Name:"F",Lore:["Skull from HeadDB.org"]},SkullOwner:{Id:"a3308587-91e3-377c-ad3b-a9eaec18952a",Properties:{textures:[{Value:"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvYzU0Y2YyNjFiMmNkNmFiNTRiMGM2MjRmOGY2ZmY1NjVhN2I2M2UyOGUzYjUwYzZkYmZiNTJiNWYwZDdjZjlmIn19fQ=="}]}}}

API Usage

GET https://headdb.org/api/head/a3308587-91e3-377c-ad3b-a9eaec18952a

{
  "name": "F",
  "uuid": "a3308587-91e3-377c-ad3b-a9eaec18952a",
  "value": "eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvYzU0Y2YyNjFiMmNkNmFiNTRiMGM2MjRmOGY2ZmY1NjVhN2I2M2UyOGUzYjUwYzZkYmZiNTJiNWYwZDdjZjlmIn19fQ==",
  "valueDecoded": {
    "textures": {
      "SKIN": {
        "url": "http://textures.minecraft.net/texture/c54cf261b2cd6ab54b0c624f8f6ff565a7b63e28e3b50c6dbfb52b5f0d7cf9f"
      }
    }
  },
  "command": "/give @p skull 1 3 {display:{Name:\"F\",Lore:[\"Skull from HeadDB.org\"]},SkullOwner:{Id:\"a3308587-91e3-377c-ad3b-a9eaec18952a\",Properties:{textures:[{Value:\"eyJ0ZXh0dXJlcyI6eyJTS0lOIjp7InVybCI6Imh0dHA6Ly90ZXh0dXJlcy5taW5lY3JhZnQubmV0L3RleHR1cmUvYzU0Y2YyNjFiMmNkNmFiNTRiMGM2MjRmOGY2ZmY1NjVhN2I2M2UyOGUzYjUwYzZkYmZiNTJiNWYwZDdjZjlmIn19fQ==\"}]}}}"
}

Minecraft Head Database

GET https://headdb.org/api/head/a3308587-91e3-377c-ad3b-a9eaec18952a