You can set up Product Builder to show different preview pictures depending on which combination of selections you make.
When you Create a New Product Builder Page, in Step 14, select the Check this box if this step will change the displayed product image option.
Once you have completed the process, you will need to Assign Images to Your Product Builder.
It may take some time for Product Builder to construct every scenario, but when it finishes there will be a list of image scenarios and a unique image will be assigned to each one. When that particular image scenario occurs during runtime that image will show up in the preview window.