iCloud 
Delete photos from My Photo Stream
When you delete photos from My Photo Stream, they are removed from the My Photo Stream album on all your devices.
On an iOS 7 device
In the Photos app, tap Albums, then tap My Photo Stream.
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Do either of the following:
Tap a photo.
Tap Select, then tap one or more photos.
Tap
, then tap Delete Photo or Delete x Photos.
On an iOS 6 device
In the Photos app, tap Photo Stream, then tap My Photo Stream.
-
Do either of the following:
Tap a photo.
Tap Edit, then tap one or more photos.
Tap
, then tap Delete Photo or Delete Selected Photos.
On a Mac using iPhoto or Aperture
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For instructions, see one of these iPhoto Help or Aperture Help topics:
On Apple TV
Go to iCloud Photos.
Select My Photo Stream, press the center button on your remote, then select a photo you want to delete.
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Hold down the center button on your remote, then choose Delete Photo.
If you simply press the center button instead of holding it down, a full-screen image appears instead of the dialog where you can remove the image.
On a Windows computer
Select iCloud Photos under Favourites in a folder window of File Explorer (Windows 8) or Windows Explorer (Windows 7), then double-click My Photo Stream.
Right-click a photo you want to remove, then choose Delete from the menu that appears.
For more information about deleting photos from My Photo Stream, see the Apple Support article iCloud: How to delete photos from Photo Stream.