1girl, ahoge, ball, bikini, breasts, fog, full_moon, greyscale, holding, holding_ball, idolmaster, idolmaster_shiny_colors, large_breasts, looking_at_viewer, mismatched_bikini, monochrome, moon, navel, night, night_sky, skindentation, sky, standing, star_(sky), starry_sky, swimsuit, tokufumi, tsukioka_kogane