Just Follow Some Steps to recover deleted pictures from iPhone :
>> Firstly Tap The Setting
>> Than Tap The iCloud Option
>> Than Sign In The iCloud Using The Apple ID And Password
>> Than Click On The Storage And Backup
>> And Restore The Backup Which You Have Made
>> Than Your Contact Are Back In The List.
If they don't work, you can try iPhone picture recovery tools.
how to recover deleted videos from iPhone