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In case you have images and want them to be the same for all store views, you can import your products to default store view and for other ones set option - use the same as default.
If you need to have different images for products at each store view, then I recommend you to import corresponding images to concrete store view - lets say you have 3 store views, then you need to import 3 times bringing images to each store view.
There is the application called Store Manager for Magento, using it you can import to particular store view, besides, if the products are already in the store, you can in the file use only image SKU and column with images.
In case you are interested, here you can download free 2-week version of Store Manager here -
In case I misunderstood you and you need something else, please, let me know.