octopus hand-drawn in watercolor seamless pattern on dark blue background. high quality blue gradient monochromatic

octopus seafood animal mollusc creature ocean underwater wildlife undersea aquatic monster tentacle life sealife aquarium graphic marine artistic depth giant handdrawn dangerous dive intelligent reef camouflage coastal menu indigo scribble submerged isolated drawing watercolor image vignetting seamless pattern drawn artwork painting purple monochrome souvenir