Most sellers online steal the pictures from Disney and don't show you the actual photos of the imitation doll they are selling. Therefore, you can't always trust the images shown on a product listing.
If you're buying from an individual seller on a site like Craigslist or OfferUp, you can always contact them to ask for additional photos. If they refuse, you should back out of the transaction. Additionally, don't ever hand off any money to the seller unless you're sure you're getting the real deal.