AI Prompt for Retro Futuristic 3D Space Poster Design

"A spectacular and vibrantly colorful retro futurism vertical poster, a bold composition featuring a chunky 3D cartoon rocket ship in {argument name="rocket color" default="glossy candy red"} with bright yellow fins and a round porthole window launching upward trailing a thick swirling rainbow exhaust cloud in {argument name="cloud colors" default="electric pink cyan lime green and orange"}, surrounding the rocket oversized 3D planets each a different vivid color — a giant striped Jupiter in warm orange and cream, a ringed Saturn in pastel lilac with a glowing gold ring, a tiny Earth in vivid turquoise and emerald, dozens of glossy 3D stars in bright yellow and white scattered across a deep cobalt blue sky gradient background that shifts from rich royal blue at the top to warm violet at the bottom, floating 3D astronaut helmet in chrome with a rainbow visor reflection, bold chunky rounded typography at the top reading "{argument name="main text" default="SHOOT FOR THE STARS"}" in massive gradient letters shifting from hot pink to electric yellow, smaller bouncy subtitle below "{argument name="subtitle" default="Dream big · Launch bigger"}", tiny sparkle and comet trail symbols scattered across the composition, ultra-vivid saturated colors throughout, premium 3D illustration quality, 9:16 vertical ratio"