1girl, alternate_costume, artist_logo, blue_one-piece_swimsuit, blunt_bangs, breasts, brown_hair, collarbone, competition_school_swimsuit, covered_navel, cowboy_shot, dated, eyebrows_hidden_by_hair, green_eyes, helena_(kancolle), kanon_(kurogane_knights), kantai_collection, large_breasts, long_hair, looking_at_viewer, one-hour_drawing_challenge, one-piece_swimsuit, school_swimsuit, simple_background, solo, swimsuit, thigh_gap, white_background