Sync your phone with iTunes where all your data should be. If you have never synced with iTunes then your data are lost. Pictures are generally kept in iPhoto on your computer or stored in the Pictures folder. If not, then they are also gone.
As for music and apps: .Downloading past purchases from the App Store, iBookstore, and iTunes Store
Don Tiew wrote:
I accidentally reformat my iphone 4s and update to ios 6
Hogwash. There is no way this can be done "accidentially". If you updated to iOS 6.1.3 from an iOS version lower than iOS 5.0, it was an erase/restore deal. Look Itunes>Preferences>Devices...any backups listed? If not, & your data was not on your computer before you elected to update, then there is no way to restore it.