hello summer card banner. unique shells, cardiidae bivalve molluscs gastropoda corculum cardissa or the heart cockle. sketch

aquaculture aquatic art backdrop background beach bivalvia blue calligraphy card celebration conch creative design doodle drawing drawn element exotic gastropoda graphic green greeting hand hello holiday illustration invitation life marine mollusk natural nature nautilus ocean oceanic scallop sea seafood seashell shell shellfish shells sketch snails souvenir spiral summer symbol travel tropical vacation vector