Prompt code:
A vibrant and nostalgic illustration of six retro 70s-inspired posters, each featuring cheerful elements like smiley faces, rainbows, and mushrooms. The design exudes a sense of peace and happiness, with bold colors and groovy patterns. The background is minimalistic, showcasing a pencil sketch of the posters before they were inked and colored black, red, and white on a pristine white canvas. The overall aesthetic evokes the spirit of the 1970s and a sense of timeless joy.
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