Eshop product listing does not display thumbnail

Hope someone can help me.
I am not a techie person, so bare with me.

I installed the eshop plugin onto my site below which is running on atahualpa theme.
However, the listing of products under menu store-products does not show the thumbnail of the product.
One has to click on the individual item to see the pictures.

http://www.sepuh-crafts.com/store/products/

Can anyone help?

Or is there an easier ecommerce plugin for a non techie person like me to use?
Please...any help is much appreciated.