Here is some configuration which we applied in our template
1. – Go to "Extensions/Virtuemart/Configuration" to do some general configurations.
2. – Go to "Extensions/Virtuemart/Products/Custom Fields" to create some custom fields.
3. – Set height and width for product images for shop pages
Please go to "Extensions/Template Manager/ One template style/Template/In the tab: Option Template
Note: This step can be done after you select the template style for the shop page