Check the Google Photos Trash/Bin
Check the Gallery app Recycle Bin/Trash
Check Samsung Gallery Trash if using a Samsung phone
Check Google Drive backups
Check OneDrive, Dropbox, or other cloud backups
Check SD card recovery if photos were stored on a memory card
Use a file manager to look in DCIM, Pictures, and Downloads folders
Restore from a recent phone backup
Use a data recovery app from the Play Store
Connect the phone to a computer and use recovery software
Stop using the phone immediately to avoid overwriting deleted files
If needed, contact a professional data recovery service