How to sell multiple digital products

I am new to wordpress and very use to building in Dreamweaver, but wanted to give WP a try. I am building a photography website, where my client wants to be able to sell her images in digital packages. I am not interested in purchasing more stores and plug-ins. My question is I have the store built in wp ecommerce, but for some reason it will only show 1 picture of product, how do I get multiple pictures/products to show under one category? If 1 customer has 40 photos, do I have to create a category for each picture, so they can download Hi-res pictures? Any help would be appreciated!

http://wordpress.org/plugins/ready-ecommerce/