I think you may made an mistake in posting image. Check out the html tag used by you is correct. If html tag is posted wrongly the image will not be shown. If your resource is still not viewed by webmaster you may edit your resource and check the html tag used is correct.
If you want to delete your resource post the link and request webmaster to delete that resource.
You can add some text in the duplicate articles as "Editors- Please delete my duplicate posts". Leave the original article as it is. I believe that might be enough. The editors will take care of duplicate posts and delete it.
If images are posted wrongly then use the HTML tags of the required images properly .