I am trying to see how this works but having some problems. Here's an an example: I go to a page of wikiart to see if i can download the images from it. I clear the preferences and check image download as instructed. At first a try a less deep scan to download a single page but that doesn't work so I try the -1 level. What I get is just the thumbnails downloaded and no full size images. I've had this problem before and I am not sure what I am doing wrong. In addition, it would be nice to know if there's a way to download only large images, so I dont have folders and folders of thumbnails. Thanks!

Maybe the images are linked through Javascript - if so, enable that option in crawler options

Make sure you also see:
http://www.microsystools.com/products/website-download/help/website-gallery-image-downloader/

Else send an email with your project file and specific image url examples you belive the downloader misses (and from where they are linked/used)