blue huge sale with pow! & zap! on a retro superhero-themed digital image

no people huge sale blue rainbow splash pow zap cartoon retro speech bubbles orange background vintage superhero comic concept digitally generated theme discount promotion alert colorful marketing vibrant pop art book style advertising special offer dynamic attentiongrabbing strip nostalgia explosive savings deal shopping visual merchandising eyecatching consumer attraction bold loud culture playful energetic fun imaginative creative digital illustration graphical design bright colors graphic novel action words