The %cart_items_widget% token will display images of the products visitors added to their shopping cart.

If your shopping cart is saved across sessions ("persistent"), meaning that when users close the browser and open it again after a few hours the content of the cart will be still there, enter the cart url along with tracking parameters in the "Click on product images goes to box". 

If your shopping cart is not persistent, change the drop down value to "Product page". In this case when visitors click on a product image, they will be directed to the matching product details page.