Hello @Rodlens,
We regret to inform you that there is no automated option available in our theme to accomplish what you are looking for. You will need to manually add all the variation images.
Regarding the Color images, you can go to WP-Dashboard >> Products >> Attributes >> Configure Term >> Edit the Color and set the images as per your requirements: https://postimg.cc/B87Sq6T5
Could you please explain further what you mean by changing the weight of Add to Cart? If possible, please provide screenshots for better understanding.
Thank you for your inquiry.
Best Regards,
8Theme’s Team