tournament_contest_end_portrait_effect

tournament_contest_end_portrait_effect = {
	tournament_contest_champion_scope_effect = yes
	if = {
		limit = {
			OR = {
				scope:contest_winner ?= this
				involved_activity = {
					any_guest_subset_current_phase = { name = winner this = root }
				}
			}
			exists = scope:contest_loser
		}
		scope:contest_loser = { save_scope_as = contest_portrait }
	}
	else_if = {
		limit = {
			OR = {
				scope:contest_winner ?= this
				involved_activity = {
					any_guest_subset_current_phase = { name = winner this = root }
				}
			}
			exists = scope:second_place
		}
		scope:second_place = { save_scope_as = contest_portrait }
	}
	else_if = {
		limit = {
			OR = {
				scope:contest_loser ?= this
				NOT = {
					involved_activity = {
						any_guest_subset_current_phase = { name = winner this = root }
					}
				}
			}
			exists = scope:contest_winner
		}
		scope:contest_winner = { save_scope_as = contest_portrait }
	}
}

As written in game/common/scripted_effects/04_dlc_ep2_tournament_effects.txt.