1girl, arm_up, armpits, bare_legs, black_choker, black_dress, breasts, brown_hair, choker, cleavage, collarbone, dress, feet_out_of_frame, hair_spread_out, idolmaster, idolmaster_shiny_colors, lace-trimmed_dress, lace_trim, long_hair, looking_at_viewer, lying, lying_on_water, medium_breasts, on_back, osaki_tenka, partially_submerged, sikimosh, solo, straight_hair, tile_floor, tiles, very_long_hair