Sadly, said notification style with images posted by standalone apps don't show images in the notification (bug), and there is no support for notification groups. (xda-developers.com)
One unique feature is that they can also track and detect images, which helps for discovering and reacting to images posted on social media. (smallbusinessideasblog.com)
Just have a look on the amazing set of images posted below and get inspired by the latest designs & prints! (galstyles.com)