Okay, i didn’t realize you want to display bigger image.
To enlarge the image, you will have to modify team_member.php file which is located in wp-content/plugins/elvyre-core/includes/content-manager/team-member.
Go to line 43 where it says:
$params = array('width' => 270, 'height' => 310);
Modify those values to the desired size.
It may happen that the image will be bigger than the container in which it is placed. If that happens, you will have to use CSS to adapt the container.