The first impression is the lasting one. If you don't like your main mockup, you can swap it for another variant in the listing.
1. From the Shopify Home page, click the Products tab on the left side to enter your product list. Then, choose the product you wish to change the main mockup image.
2. Scroll down to the Variants section and click on the Edit button next to the Color line.
3. Make sure that the color you want to set as the main mockup is at the top of the list. If it is not, click and hold the six-dot icon next to that color on the left, and drag it to the top.
4. Click the Save button.
5. The color you selected has become the main mockup and will be displayed first when customers click to view the product.