1girl, bare_shoulders, beach, blue_sky, breasts, brown_hair, cleavage, day, double_bun, hair_bun, idolmaster, idolmaster_shiny_colors, jewelry, large_breasts, long_hair, looking_at_viewer, lying, mermaid, monster_girl, monsterification, necklace, ocean, off_shoulder, on_stomach, outdoors, pearl_necklace, pekoni_(peconi), pink_eyes, sky, solo, swept_bangs, tsukioka_kogane, wet, yellow_nails