Use the "External Source Article" option when displaying an article from another source. This will display the article as a place holder on your webpage but send users straight to the source when they click on it.
You can still choose to display an image as well under "Feature article options". When displaying an image with an external source, be sure to use the "External source article link" so the image is only displayed in the preview of the article. Choosing
to add the URL to the article field will result in a full page width image with only the link displayed when user click on the article.