Applications come with a default image that is displayed for the application in the blueprint and sandbox pages. To change the image, add an image in the format [app name].[image_extension] to the application's folder in the GitHub/BitBucket repository.
For example, java-spring-website.png
Maximum file size is 50 KB.
Supported file types are "png", "jpg", "jpeg", "ico", "bmp", "gif" and "svg".