how to autopost an article to facebook as an image, not as a link

Hi!
I would like to autopost wordpress-articles to the facebook-wall of our page (currently staging at https://www.facebook.com/islamunterrichtbeta).
Currently these are posted as links. I would rather like to post them as images, with the image being the central part of the post.
Is that possible?
Also, can we select a different picture for the facebook-post than the wordpress post? Links to pictures in the wp-post seem to be removed anyway before posting to facebook?!

Please help me :slight_smile:

Sincerely,

Nuri