![1girl animal_ears bad_id bad_pixiv_id blue_eyes blue_hair blush head_fins highres japanese_clothes kimono long_sleeves mermaid monster_girl nanahi_toshi obi open_mouth sash short_hair smile solo touhou wakasagihime wide_sleeves rating:s score:8 post #1906570](/cdn_image/preview/67/3d/673dd19042d088f23306e62574247a36.jpg)
For mermaids with tails that give a more fishlike impression, as opposed to designs that resemble legs wrapped in scales. Especially if the tail fins are also correct for the type of sea creature used as a basis.(Vertical for fish. Horizontal for sea mammals.)