If you were saving photos to internal phone storage and you did not have a backup copy on a computer or cloud storage, then unfortunately the files are likely gone. Sorry.
But if you were saving photos to a removable SD card even if they appear to be gone there's still a chance you may be able to recover them by putting the SD card in a laptop or PC with a card slot or USB card reader and using Recuva software:
https://forums.androidcentral.com/e?...orm.com/recuva[/
From now on, remember: Backups, backups, backups!
Android since v1.0. Linux user since 2001.