Hello,
that is just one of the layout for single product page.
you can select the layout option for single product page in,
8theme options >> ecommerce >> single product page >> page layout : http://prntscr.com/fluyko
there are 9 layouts. you may check one by one
This is our image size : https://www.8theme.com/demo/xstore/dark/wp-content/uploads/sites/5/2015/12/dark-product-3-720×961.jpg
you can use the same size or proportion.
If you have any other questions please ask it in a new topic/post.
Regards,















