Fotografi brukt i flere aviser uten tillatelse

In 2013 I did some photographs for a friend who was going to publish an article in the most read newspaper in my country. I did those pictures without charging him and he published his article with my picture and my name as we agreed. However, I have just discovered that the newspaper has continued using the picture without citing the author (me) and furthermore the picture has been used in other local and international newspapers. I would like to know if I have any compesation right.