The comments on social media were many and the critics considered that the image was unprofessional and that the Prime Minister "showed too much skin".
But far from everyone agrees.
Charlotte Cederbom is a researcher in gender history at Åbo Akademi University in Finland and she thinks that the criticism of Sanna Marin is unjustified.
- You might think that we should have come further. In the political climate we are in right now, there might be more interesting things to discuss than just necklines.