Hi,
What you could do is add the image in the description of the product. You would also add area/map tags in the description to setup the zones where the image can be clicked on:
www.w3schools.com/tags/tag_area.asp
And for the link on each "area" tag, you can use the add to cart link of each variant:
https://mywebsite.com/index.php?option=com_hikashop&ctrl=product&task=updatecart&cid=XXX&qty=1&add=1
where XXX is the id of the variant (you can see the id of the variant in the link to the product page in the cart after you added the variant to the cart).