minecraft-assets/assets/minecraft/models/item/skull_dragon.json

{
    "parent": "item/skull",
    "display": {
        "gui": {
            "translation": [ -2, 2, 0 ],
            "rotation": [ 30, 45, 0 ],
            "scale": [ 0.6, 0.6, 0.6 ]
        }
    }
}