Hi there,

For the photo image size in the email notification, we actually hardcode the image width to display in small size so that the image will look properly in email content. If you want to change the image width, you will have to modify this file at 'JOOMLA/media/com_easysocial/apps/group/photos/photos.php' at line 522:

$template->content 	.= '<img src="' . $imageSrc . '" width="128" />';

and replace the '128' to the width you want.

Hope this help and have a nice day