The Taoiseach of Ireland is Micheál Martin, the President of Argentina is Alberto Fernandez, and the Prime Minister of Greece is Kyriakos Mitsotakis. Also, I would consider the "leader" of Cuba to be the First Secretary of the Communist Party, not the President, so Raul Castro should be pictured.
Good quiz, hard to keep up to date, especially for those countries who change their leader a lot.