1. A method comprising: accessing a descriptor and a set of images that depict an item described by the descriptor, the item being a specimen of a product having a three-dimensional (3D) shape, an image among the set of images depicting a characteristic that is present in the item yet absent from the product of which the item is a specimen; generating a 3D model of the item based on an accessed 3D model of the product and based on the image that depicts the characteristic that is present in the item yet absent from the product, a 3D shape of the 3D model of the item matching the 3D shape of the product, the generating of the 3D model of the item being performed by one or more hardware processors; generating a model viewer configured to provide for viewing the generated 3D model of the item; and causing display of a user interface of the model viewer that presents the generated 3D model of the item and presents a contact seller button that is configured to generate a communication with the seller.