1girl, arm_behind_head, arm_up, black_sports_bra, blue_eyes, breasts, emblem, girls_und_panzer, grey_hair, itsumi_erika, kuromorimine_(emblem), large_breasts, looking_at_viewer, mamaa_(maeni6379), medium_hair, midriff, navel, open_mouth, smile, solo, sports_bra, sportswear, upper_body