Hi,
the image K2 uses imported from Easysocial is in an extreme low resolution.
Please, check a user's profile page in easysocial or this K2 profile image in this item:
Hi Jozsef,
I am sorry. I can't understand you well, which image you're referring to? Perhaps you can provide us with appropriate screenshot so that we can understand this better.
Please replace the attached file in: ../plugins/k2/easysocial/easysocial.php and see how it goes. If it doesn't work, you can provide your your FTP so we can fix this.