By default, Google News is displaying images of your cards in its articles.
If you want to change this, you can do so by changing the article title or by clicking the Edit button.
To change the default Google News image, go to Settings and click the Cards button.
Now, click the Settings button again.
In the new settings window, you will see the option to change the image to something else.
If this is the case, just click Edit and make a new image, then click Save Changes.
To turn off the default image, click Edit again and choose No Image.