1girl, arms_behind_back, artist_name, bed_sheet, blush, bob_cut, crawling, full_body, girls_und_panzer, graphite_(medium), hand_on_ground, kneeling, leaning_forward, light_blush, long_sleeves, looking_at_viewer, monochrome, narrowed_eyes, neckerchief, on_bed, one-hour_drawing_challenge, ooarai_school_uniform, open_mouth, paper_texture, pleated_skirt, sailor_collar, school_uniform, sekirei_tessar, sepia, serafuku, short_hair, signature, sketch, skirt, socks, solo, traditional_media, utsugi_yuuki