1girl aaru_(kerogero1582) alternate_hairstyle arm_behind_back ball basket black_shorts blue_outline closed_mouth collaboration commentary contrapposto cropped_legs derivative_work eyebrows_visible_through_hair from_side girls_und_panzer gym_shirt gym_shorts gym_uniform hair_tie hair_up head_tilt highres holding holding_ball itsumi_erika kiriko_works light_frown looking_back medium_hair midriff navel outside_border print_shirt shirt short_ponytail short_shorts short_sleeves shorts single_vertical_stripe solo sweat t-shirt v-neck white_background white_shirt