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Many European stores happened to have Rainbow Rocks prototype doll stock images for their doll listings, and reverse-image-searching one of them led me to a Rainbow Rocks powerpoint, by Hasbro, which featured a few doll prototypes and concept art, including this one.
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I have not been able to track down the powerpoint any longer, assuming it has been removed from public domain.
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And the crown probably was just for ornament but i wonder if it was relevant at some time of the movie development