Check the Google Photos Trash/Bin
Check the Gallery app Trash/Recycle Bin
Check the Files app Trash/Recycle Bin
Restore from a cloud backup
Check Samsung Cloud if you use a Samsung phone
Check Google Drive backups
Check OneDrive, Dropbox, or other synced apps
Use a file recovery app from the Play Store
Connect the phone to a computer and scan with recovery software
Check the SD card if the photos were stored there
Stop using the phone immediately to avoid overwriting deleted images
Contact the phone manufacturer or a professional data recovery service