digital art of a vibrant, whimsical octopus with flowing tentacles and a playful aura

abstract octopus digital art colorful vibrant whimsical playful illustration tentacles sea creature ocean life surreal fantasy artistic modern underwater aquatic marine psychedelic pastel colors concept gradient fluid animal surrealism oceanic design bright imaginative artwork graphic mollusk ink effect watercolor style fluidity world fauna iridescent dreamy theme cheerful ai generated