Well, if your precious photos are deleted or lost and you are looking to recover them then backup can help you. You can check the backup files for the photos you have lost. If you don't get the pictures from backup then only one thing left and that is using
Samsung phone data recovery [androiddata-recovery.com]. This is an all in one software that helps to retrieve deleted or disappeared photos from Samsung phone. Not only photos but also capable of retrieving other data such as contacts, WhatsApp, documents, call logs, text messages and others.