under water. marine motif . doodle of the underwater world, sea, ocean, river . monochrome. aquariums. anti-stress coloring

abstract algae aqua aquarium art background card cartoon colorbook composition coral creative creativity curls cute design diving doodles drawn fish fishing graffiti graphics hand horizontal illustration life marine monochrome ocean page poster reef ribbons sea seashell shell starfish stripe summer symbol under underwater vector wall wallpaper water wave wild world