If you have uploaded your images to the ‘Images’ tab found when you click the ‘Edit’ button to the far right of the product found on the ‘Manage Inventory’ and those images are not replacing the old images, then the issue is you do not have [Page Ownership|http://www.amazon.com/gp/help/customer/display.html?nodeId=200202130] to make the changes.
If you recently uploaded the images, it can sometimes take up to 24 hours for images to be replaced. If you have waited 24 hours and the images have not changed, you need to open a case with Seller Support to request the changes. To do so, click Contact Seller Support at the bottom of this page. Click ‘Products and Inventory’ and then ‘Product Page Issue’ and then click the radial for ‘Fix a product page’.
Fill out the form and a case will be opened for the catalog team to review and make the change should they feel its required. You will want to include as much supporting data as you can to prove. The item listing (URL) for the manufacturer’s website, for example, would be helpful. Do not rely on Amazon to assume anything.
Changes are usually done within a day as long as they agree with your request.