Your images are triggering a "500 Internal Server Error", presumably because someone has done something on your site to set exclusion rules for files in your /images folder.
Example:
http://thehandsomewoodman.com/images...dyDSC_0447.jpg ... visiting that URL displays the error.
Probable cause: I'm guessing someone has altered the /images/.htaccess file or has added a /.htaccess file which blocks images from displaying.
Zen Cart comes with a /images/.htaccess file (and similar (but different) .htaccess files exist in many other Zen Cart subdirectories. But Zen Cart does NOT come with one in the "root" folder, ie: your public_html or www folder where the top of all your Zen Cart files are located. If there's a /.htaccess file there then that was added by you or someone with access to your server.