3 Ways you can choose:
1. Restore deleted iPhone pictures from iTunes
You can regain your deleted photo by extracting the previous iTunes, connect your iOS device to the computer which you normally sync with, then click the File menu and select Devices > Restore from Back up
2.restoring from iCloud, if you have an available backup file
3. iPhone photo recovery tool, If you have no backup files, there is the last you can use EaseUS MobiSaver, a third-party iPhone photo recovery tool yo get your images back.