Why are there no Hover Pics in my theme like in the preview?
There is a problem with the file permissions in your wordpress.
Some more explanations here: http://codex.wordpress.org/Changing_File_Permissions
Going with Wordpress Codex’ we recommend for all folder 755 and for all files 644.
In case you cannot perform the file permission changes on your server contact your provider/server host with this topic.