Sorry for the delay in answering.
1/ Theme Options > WooCommerce > Single product page or SIngle Product Builder > Variation gallery. After that edit product and add the gallery images for your variations like here – https://prnt.sc/xhomle
2/ There is no such option by default. You can implement it only by additional customization of the etheme_sale_label_percentage_text function (xstore/framework/woo.php) in the child theme if you have PHP skills.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.