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Yes, I have actually sketched something (raw) on paper. Tomorrow I should be able to show you a preliminary digital copy, before eventually proceeding with the definitive artwork (after eventual suggested tweaks/changes and whatnot).
Wow man that looks REALLY nice! Definitely worth the wait. If it weren't too much to ask, would it be any trouble replacing Alolan Marowak with something else like Gengar maybe? It's not the most relevant Pokemon atm so it wouldn't fit the theme as much as Gengar. Other than that man, I'll give you the go ahead to finish up. Can't wait to see the final product.