Images are not being zoomed in

Under Classifieds->Settings, Images tab.

Look at your thumbnail size and look at your “regular” image size. Both are set to 100×100.

You need to change the “regular” image size to something more normal–like 640×480, 800×600 or whatever you think looks good. But because they are the same, the images are getting resized to be the same as the thumbnail, that’s the root cause here.