Retro Tropical Postcard for Graduation Party Insert Cards

Postcard design celebrating / promoting: graduation party insert cards. Postcard kind: travel souvenir. Visual style: retro 1960s travel, playful joyful mood, tropical vibrant palette. Hero illustration / photograph with the message / location name / company name rendered as clean placeholder typography in matching style. Print-ready 6×4 inch postcard composition, strong visual hierarchy, no watermarks. No real-celebrity faces. Where the postcard references a real location, render it tastefully and recognisably without infringing copyrighted attractions. Placeholder text rendered sharp and readable. Target search intent (rendered visually, no on-image text): "graduation party insert cards" (en).