I've never managed to get this combination before though, I am trying.

I've managed to get the Monarch Butterfly pelt on my deer.

The skull face apparently is only around Halloween during Abiogenesis. A giant zombie deer will give you the skull face if you set a spell on it.

The flowered antlers are alluding me as well. Years ago, I remember getting that one on my deer all the time. So I don't know why I can't manage it now.

I really haven’t played the game much in 4 years. The game has changed but surprisingly, not that much.