Hello, sorry but this is out of our scope of support, this issue is not related with the theme functionality. However we will try to help you.
So, when you add the main link of the store, all the products appear fine, but if you add a link of a specific product it doesn't display the image, right?.
Would be useful if you can send us the exact link of the product you want to display. So we can take a look and compare with the helloPod code.