the current feature graphic in the Play Store is the openHAB icon and slogan:
As you can see, the icon nearly touches the border. This causes the icon being cut in some situation. To fix this, there should be at least 50px space between the “main elements” of the image and the border.
IMO a different background also improves the image. If someone wants to give it a try, feel free to post your image here.
This image can also be used for https://github.blog/2019-04-17-custom-open-graph-images-for-repositories/