1girl, breasts, byleth_(female)_(fire_emblem), byleth_(fire_emblem), cleavage, cosplay, fire_emblem, fire_emblem:_three_houses, fire_emblem_heroes, green_eyes, green_hair, hair_ornament, looking_at_viewer, medium_hair, official_alternate_costume, open_mouth, outstretched_arm, ribbon, rokiko, simple_background, solo, sothis_(fire_emblem), sothis_(fire_emblem)_(cosplay), upper_body