sea horse doodle coloring book page. antistress for adults. zentangle style for print, tattoo, coloring book page. black and white

abstract adult animal antistress aquatic art background black book cartoon color coloring contour decorative design doodle drawing drawn fish graphic hand hippocampus horse illustration isolated line marine monochrome nature ocean ornament outline page pattern print sea seahorse sketch stress stylized summer tattoo tribal tropical underwater vector water white wildlife zentangle