sargassum, brown algae , drawing, colorful doodle

algae art bacciferum beautiful black bladder botany branch brown colorful cut deep digitalized doodle drawing edible engrave engraving etching floating flora food gasfilled green hand illustration ink invasive kelp leaf leaves life line made marine nature ocean paper pencil photosynthesis plant problem realistic retro sargassum science sea seaweed sketch then underwater vector vintage was water what wildlife