2girls alternate_costume animal_ears blue_eyes blurry blush bokeh box braid breasts brown_hair capelet christmas_tree_costume closed_mouth cosplay depth_of_field gift gift_box gloves green_gloves grey_hair highres holding holding_box horse_ears horse_girl horse_tail jitome large_breasts long_hair looking_at_viewer multiple_girls open_mouth pom_pom_(clothes) red_shirt red_skirt santa_costume shiromaru_illust shirt single_braid skirt smile standing super_creek_(umamusume) symboli_rudolf_(christmas_emperor_tree)_(umamusume) symboli_rudolf_(umamusume) symboli_rudolf_(umamusume)_(cosplay) tail tamamo_cross_(umamusume) umamusume