1girl, breasts, cleavage_cutout, closed_mouth, clothing_cutout, fingernails, happy_birthday, honkai_(series), honkai_impact_3rd, jacket, lips, looking_at_viewer, lxyuki32, lying, mole, mole_on_breast, murata_himeko, murata_himeko_(battle_storm), on_back, red_hair, red_jacket, sleeves_past_elbows, smile, solo, yellow_eyes