Hi,
1. For the currency, you want to select your currency in the "main currency" setting of the HikaShop configuration.
2. I've entered different images for different variants of the products. So each variant's images takes over the images of your main product (see when you change the characteristic selection, the image changes).
If you want to have several images for each variant and different images for each variants, you need to enter the several images of each variant in each variant via the "manage variants" button of your product.