Delete picture from photos view, keep in albums
This is (sort of) possible in iOS 9.


Go to albums
Find your picture(s)
Tap the share button in the bottom left
Tap "hide"
It will ask if you want to hide the picture, stating "it will be hidden from moments but still visible in albums"
Tap "Hide Photo"


The picture will not be visible in the Photos tab but it will be visible in your albums.

To unhide the picture, go to Albums > Hidden, select your pictures, tap the Share icon and tap "Unhide"