A whimsical, folk-art coastal poster illustration depicting a vibrant underwater reef full of marine life. A giant blue whale covered in decorative floral and geometric woodcut patterns swims horizontally across the center. Around the whale are stylized sea turtles, floating jellyfish with neon tendrils, and schools of striped fish navigating through kelp forests. A classic acoustic guitar is submerged upright in the center, its body acting as a coral reef home for small sea creatures. The typography "OCEANIC SOUNDS FESTIVAL" is rendered in customized geometric serif lettering with nautical flourishes at the base. Color palette features deep cobalt blue, seafoam green, bright coral pink, and golden yellow. Paper texture overlay, screen-print halftone aesthetics, balanced symmetrical composition, high detail graphic design.