If you choose to send out a Welcome Email, asking your subscribers to personalize, the default setting is to use your profile image as the header. However, you have the option to instead upload a Welcome Photo that will be used as the header instead of your profile picture.
While adding a Welcome Photo is optional, it is the image that is, well, welcoming them to your Cerkl! You can make the experience even more personalized for your subscribers by creating a unique graphic. And, as you know, personalization is what we are all about here at Cerkl!
You can read more about the welcome photo here.