I would love to recommend some product option apps that help you to show a pop up with a variant image.
I have an article that listed the top 5 product option Shopify apps that I used.
For example, you can consider using Best Custom Product Options or Product Personalizer apps. Both of them provide the image/ color swatch. This article also points out the pros and cons of each of them so you can have a better decision. And if you are editing and designing a product page, this guide will help you with some tips and helpful ways to draw attention and traffic.
Let me know if you have any questions. Cheers!
You're welcome, @Semillarium . If you see it is useful, you can give me a like and mark as a solution.
If you have time, you can check this guide about how to personalize pages to meet the customer's unique needs.
Let me know if you have any questions! Cheers!