Delete photos in iOS 8
Remove all your images from an iPhone or iPad
To delete a photo, find it in your Photos app and then tap ‘Select’ in the top-right corner. Now, tap the bin icon in the bottom right corner and tap ‘Delete photo.’
You can select multiple photos at once and then tap the bin icon to delete all of the photos selected.
If you’ve created your own folder of photographs and want to delete the whole thing, go to the Albums view and then tap Edit in the top right corner. You can now tap the red circle that appears on the left to delete the album. You won’t be able to do this with the default folders created by Apple.
In iOS 8, however, when you delete photographs by following the instructions above, they don’t actually delete from your iPhone or iPad