When a thumbnail picture is put in the comments section for a movie or a car the image is maintained on imageshack and not on the site. When you click on the thumbnail the imageshack picture is displayed. So the thumbnail images should be kept on imageshack or they won't be available.

The main pictures are kept on the site and once they are uploaded imageshack pics for them are not needed after the upload.

There are no thumbnail pictures in the comments for this movie so you can delete them from imageshack if you want.

Imageshack claims that they have plenty of space so I don't bother to delete anything.