Nice clean design,

As that's a zen cart shopping cart you've got plenty of options with the layout of your products I'd put 3 images across and two rows and then next box have new/featured products.(On my screen there's 2 products across and only 2 down on one side)

Here's a link to the image handler, its easy to install (make sure you back up before) it will improve the performance of your website speed look(no stair-effects, smooth edges) etc, Image Handler 2 for v1.2.7, Zen Cart | free shopping cart software I've tried downloading that website on dial up and it took nearly 10 minutes and you can tell the images are squashed. But the image handler will automatically resize your pictures.