Using photo data recovery software is typically very safe for recovering lost images provided you download it from a reliable and good reputation source. In fact, pretty much all professional recovery software are read-only, thus they only scan your storage device without changing or overwriting existing data. So the risk of additional data loss is very low. In order to be 100% safe, users should not use the affected device any more from the moment of photo deletion and should also strictly adhere to the software instructions during the recovery process.