Hello,
Please follow the instructions :
First, please note that the default upload folder for images in HikaShop is not images/hikashop/ but images/com_hikashop/upload/
Also, if you uploaded your images in the upload folder of HikaShop, you should just specify the file name like "antiquesink.jpg"
Otherwise, the system will actually look for the image in images/com_hikashop/upload/images/hikashop/antiquesink.jpg
And for the loading of variants ; you need to specific the product parent in order to link a variant to his main product.
Regards,