detailed vintage of an octopus and its curling tentacles, drawn in line art style, ideal for marine biology and

engraved octopus tentacles line art drawing marine life black white invertebrate sea creature detailed artistic sketch nautical ocean biology zoology scientific nature aquatic wildlife underwater engraving vintage curling suction cups ink texture animal oceanography cephalopod mollusk natural history elegance anatomy design tentacle movement graceful organic pattern elegant fauna curious tattoo