Check Recently Deleted/Trash in your Photos app (open Photos, Albums, Recently Deleted, restore)
Check cloud backups (Google Photos Trash/Recover, iCloud Recently Deleted/Recover)
Restore from device backups (iCloud Backup or Google Account backup)
Restore from a computer backup (Windows File History/Backup, macOS Time Machine)
If images were on an SD card or USB, stop using the device and recover using a reputable recovery tool
Use a recovery tool for the specific storage type (Windows/Mac SD card recovery software)
For iPhone/iPad: if not in Recently Deleted, use iCloud backup restore or Finder/iTunes backup restore
For Android: check Google Photos Trash and device storage recovery options; restore from Google backup if available
If images were synced to a computer (OneDrive/Google Drive/Dropbox), check the provider’s Trash/Deleted items and restore
Contact the service/provider support if the images were part of a shared album or account recovery flow
If you tell me your device type and where the photos were stored (phone/SD card/cloud), I can suggest the exact steps