@MissShelly, I could access your site to see the problem, make sure that there are no javascript error on your page.

Here is the list of common problems why images are not showing for people.

• javascript errors.
• directory and file permissions
• not deactivating and activating the plugin.
• not enough memory resources set the “WP_MEMORY_LIMIT”
• problems with apache “allow_url_fopen” fixed on 3.1.1
• conflicts with other plugins using or not setting WP_MEMORY_LIMIT properly.