Does the cart support an image gallery for products?
The cart supports multiple product image if you setup product variants you can associate a product image with each product variant. On the product detail page when the user changes the product variant the image will change to the image associated with the product variant.
If you dont use product variants then the cart supports 2 images per product a thumbnail on the product listing page and a large image on the product detail page.
If you would like to add additional product images, navigate to the product setup screen and you can add an unlimited number of product images using the fckeditor.
On the dev roadmap we have a lightbox image gallery so stay tuned for that in a future release.