While the plugin listing that we put in place by creating a readme.txt file and uploading it to the official plugin repository is perfectly functional, it does not really stand out among the sea of extensions that are available on the website. Thankfully, https://wordpress.org introduced a mechanism allowing plugin developers to add a banner image to their listing. This image can be anything from a simple picture to a complex graphic to advertise your creation.
This recipe explains how to prepare images for your plugin and how to upload them to your repository.