1girl, azumi_(girls_und_panzer), blue_eyes, breasts, brown_hair, choker, christmas, full_body, girls_und_panzer, gloves, hat, holding, holding_sack, large_breasts, looking_at_viewer, matsui_yasutsugu, one-hour_drawing_challenge, panties, red_footwear, red_panties, sack, santa_costume, santa_hat, signature, simple_background, solo, starry_background, underwear