Currently, odoo does not provide any kind of feature to manage product images from URL. You can do that using this module. You need just past image URL in 'Product Image URL' that's it.
Product Image From URL Odoo.
Put Product Image URL Module, Manage Product Picture From URL, Upload Goods Photograph From URL Odoo.
Product Image URL App, Manage Picture Url Module, Upload Pic From URL Odoo.