As you've probably seen, we're listing the 500 most popular Jimdo-Pages, screenshots included, on our website, here. You now have the option to manually update your screenshot if your Page makes it onto the list.
So, if you change your Page layout or make other significant changes to your homepage, just log into your Jimdo-Page, click on "Jimdo Account" and "Screenshot of your Jimdo-Page." Your screenshot will automatically be updated. You can update your screenshot once every 24 hours.