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Took the head off and put some pulled cotton into the dome, saw a Mysterio custom on Instagram where they did it and I liked the look. The cape has a peg so it still holds to the body just fine without a head.
Decided Mysterio can hold onto the skull for now. I can see where the green skull would be more desireable for using as an accessory since it would match the green smoke effects, but I have other plans for this head anyway.