1girl, breasts, bronya_zaychik, bronya_zaychik_(black_nucleus), closed_mouth, cropped_torso, drill_hair, error1980, grey_background, greyscale, hair_ornament, honkai_(series), honkai_impact_3rd, leotard, looking_at_viewer, monochrome, simple_background, small_breasts, solo, twin_drills, white_leotard