1girl bangs bikini bikini_top_only blush breast_hold breasts brown_eyes brown_hair elf_(stroll_in_the_woods) girls_und_panzer highres jacket jacket_over_swimsuit looking_at_viewer navel nishizumi_miho ooarai_military_uniform open_clothes open_mouth school_uniform short_hair simple_background solo sweat swimsuit white_background yellow_bikini