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As it is currently coded, your ImageProduct has an many-to-one relationship to Product. This essentially means that a Product can have many ImageProducts.
Please also note that the variable name last_product is misleading, it should be eg. products to avoid confusion, as it is a queryset and not a single model.
So you could access the last product with something like last_product = products.last().
You can access the related set of ImageProducts from the parent with this:
last_product.imageproduct_set
If a model has a ForeignKey, instances of the foreign-key model will have access to a Manager that returns all instances of the first model. By default, this Manager is named FOO_set, where FOO is the source model name, lowercased. This Manager returns QuerySets, which can be filtered and manipulated as described in the “Retrieving objects” section above.
Reference: Following relationships “backward”.
See also the documentation for related_name if you wish to change the imageproduct_set.