Historically, Carnival Cruise Line required all photo purchases to be finalized while still on board the ship, but their "Pixels" photo service has evolved to offer some post-cruise flexibility. If you purchased a digital photo package during your sailing, you typically have a window of 30 days from the start of your cruise to download those images from the Carnival "Photo Cloud" website. However, if you did not purchase a package or specific photos while on the ship, it is generally not possible to buy them once you have disembarked. Carnival's policy states that due to the massive volume of images captured on every sailing, files are deleted shortly after the voyage ends to make room for the next group of guests. If you have a specific inquiry about a lost purchase or a technical issue with a USB drive you bought on board, you can contact their "Fun Shops" guest services, but "window shopping" for new photos after the trip is usually not an option.