From Kingdom Hearts Wiki: A world of information not accessible by Gummiship
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Lucky Emblems are Hidden Mickeys in the worlds of Kingdom Hearts III. They can be photographed with the Gummiphone. While the majority of them are simply standard Mickey Heads stamped into a wall, they can sometimes be more esoteric, incorporating standard objects that resemble a Mickey Head when viewed from a specific angle.
The amount of Lucky Emblems photographed is tied to unlocking the Secret Ending. On Beginner, the player must photograph all 90 of them. On Standard, the requirement is 60. On Proud, the requirement is 30.