I would like to replace the dots with product pictures. (Picture below)
Prestige theme uses Flickity slider library and my skills to change that are too low. (I did try for a few hours)
It would need customization to implement this feature, Unfortunately, there is no simple solution otherwise I will be happy to help you.
I would suggest hiring a Shopify expert to assist you OR feel free to contact me.
If you still want to do it yourself.
You can search with this keyword: 'Flickity slider with thumbnails'
Here's an example: https://codepen.io/atelierbram/pen/LRkAxQ
Or if you feel not comfortable with the code, hire some developer to do it for you. It would take 1 - 2 hours of working.