#2: Do you use relevant category page design (Grid view or list view)?
If product images are the main factor for your target audience (i.e., jewelry store), it's better to use grid view. If you are selling complex products with specific attributes (i.e., cameras, computers, printers, any complex devices), specs (i.e., power, battery, dimensions, etc.) are much more important than visuals here, so it's better to use a list view.