i lost all my iphone photos when i accidentally restored it, how do i get that back?

if you have a backup then see link http://support.apple.com/kb/HT1766

If you don't have a backup, then your pics are gone.

if you have an icloud or itunes back up then you can get them back, if you never mad a back up then they are lost.

http://support.apple.com/kb/ht1766