PhotoStream doesn't exist any more. The pictures you had there are now somewhere in Photos - Photos - Collections.
The folders that existed in iOS 7x were Camera Roll, Imported, Last Import, several folders from apps that saved images to the iPad, and PhotoStream. There was no "My Photo" folder afaik, unless you created it. The photos there were still in Camera Roll, so you'll find them in "Recently Added" now, as well as in Photos - Photos - Years/Collections/Moments.