How make custom skin for NPC with my code

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Here my code

const [x, y, z] = thisPos
let mob = api.attemptSpawnMob("NPC", x, y, z, {
name: "TEST",
playSoundOnSpawn: true, variation: "default"
})
api.setMobSetting(mob, "ownerDbId", null);

api.setDefaultMobSetting("NPC", "maxHealth", 100);
api.setDefaultMobSetting("NPC", "baseWalkingSpeed", 5);
api.setDefaultMobSetting("NPC", "baseRunningSpeed", 5);
api.setDefaultMobSetting("NPC", "initialHealth", 100);
api.setDefaultMobSetting("NPC", "attackDamage", 20)
api.setDefaultMobSetting("NPC", "chaseRadius", 10)
api.setDefaultMobSetting("NPC", "territoryRadius", 20)
api.setDefaultMobSetting("NPC", "hostilityRadius", 0)
api.setDefaultMobSetting("NPC", "attackRadius", 1.15)
api.setDefaultMobSetting("NPC", "ridingSpeedMult", 2.5)
api.setDefaultMobSetting("NPC", "maxFollowingRadius", 10)
api.setDefaultMobSetting("NPC", "minFollowingRadius", 0.85)
api.setDefaultMobSetting("NPC", "onTamedHealthMultiplier", 500)
api.setMobSetting(mob, "tameInfo", {
tameItemName: [
"White Paintball",
],
probabilityOfTame: 5,
isSaddleable: true,
supportsFriendship: true,
likedFoods: [
"Red Paintball Explosive Item",
"Orange Paintball Explosive Item",
"Yellow Paintball Explosive Item",
"Lime Paintball Explosive Item",
"Green Paintball Explosive Item",
"Cyan Paintball Explosive Item",
"Light Blue Paintball Explosive Item",
"Blue Paintball Explosive Item",
"Purple Paintball Explosive Item",
"Magenta Paintball Explosive Item",
"Pink Paintball Explosive Item",
"Brown Paintball Explosive Item",
"Black Paintball Explosive Item",
"Gray Paintball Explosive Item",
"Light Gray Paintball Explosive Item",
"White Paintball Explosive Item"
],
neutralFoods: [
"Gray Paintball"
],
dislikedFoods: [
"Black Paintball"
],
guaranteedDrop: "Gold Coin",
commonDrops: [
"Gold Coin"
],

levelUpBonuses: {
1: "Renaming",
2: "Special Drops",
3: "Mob Yield",
4: "Damage +",
5: "Poison Claws"
}
})

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I want add with api.changePlayerIntoSkin(playerId, "head", "wizard")

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And change colour gradient

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Anyone -_-

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For the game i will going to created that game (Find the Key for NPC)

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E.g Bob as NPC wear purple hoodie I called Robert it just different name for NPC