seamless pattern on marine theme. underwater inhabitants. fish, dolphin, octopus, crab, seahorse, jellyfish. linear drawing. blue

animal aquarium aquatic art backdrop background black blue cartoon character childish clown crab cute deep design dolphin doodle drawing drawn fish graphic green hand horse illustration inhabitants jellyfish life line marine nature nautical ocean octopus outline pattern sea seamless set sketch starfish summer texture tropical underwater vector wallpaper water wave