Maybe it's drawn by humans? Maybe by Joyboy himself?
That's highly possible yeah
@Salah WG might be on the right track regarding that the true villain isn't even depicted here. You can't really tell who is the "main" villain in that drawing, you have several fractions fighting, some winged demon, some serpent and some dragon, and according to the lore, there were different gods (earth god, forest god, sun god). The question is, what or who is the main power source.
Same as every Kingdom so far,
War between Two Parties over Throne, while Outside Force wants to Loot the Place,
Drum Kingdom ---> Wapol vs Dalton ---> Blackbeard
Arabasta ---> Cobra vs Koza ---> Crocodile
Skypiea ---> Gan Fall vs Wyper ---> Enel
Ryugu Kingdom ---> Neptune vs Hody ---> Big Mom
Dressrosa + Wano ---> Doffy vs Kyros + Orochi vs Oden ---> Kaidou
I said it multiple times, Main Villain is not from this World, He is an Outsider,
Since OP World has "One Piece" Treasure, that makes it like this Villain's Upper Yard, meaning this OP World is actually a Piece of it's own Kingdom, it's the "Missing Eye" of that Monster! This is why no one can find Ancient Kingdom & why WG don't want Studies about it,
(Oda even hinted at this by repeatedly drawing SHs on top of Dragon/Snake in Color Spreads)
It's not the Ancient Kingdom that is "Lost", it's this OP World that is!
And They are living inside a Second Kingdom that is this Serpent/Dragon (Similar to Laboon) hence why WG call themselves Celestial Dragons!
Because it's their Kingdom, so it's just like Skypieans vs Shandians, both have a Claim for this Land, you can't pick Favorites
I also mentioned before that Joy Boy being from Ancient Kingdom & his Story being called "Laugh Tale" is like Hiriluk's Story being called "Snowy Tale", so Ancient Kingdom was always covered in "Laughter", that's because that Monster is just like Brook, He wouldn't stop Laughing! It's basically Kingdom covered in Laughter