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Now that I remember, Doom Slayer's visor was supposed to be black with a green tint, in one of the many promotional pictures (perhaps from a nicely painted prototype) you can even see the paint appliance going slightly off showing that green tint, while in the rest of the promo pics it doesn't have it at all
Obviously the figure ended up having other issues that made everyone forget about that small detail, but this made me remember it. But then again, King Shark's is a much more complicated scenario, with the megafig version supposedly having different paint appliance that must act as the incentive to get it.