My iphone 4S was stolen. It was running on the latest iOS so is there any way that I can retrieve the pictures?

Do you use Photo Stream and was it turned on? If you do and it was, and if you have a computer and that was setup for the photos to download automatically, then the photos should be on your computer.

How many photos are stored in My Photo Stream on my devices and computers?

iCloud pushes all your photos to the My Photo Stream album on your devices and computers, and manages them efficiently, so you don’t run out of storage space.

Your iOS devices keep a rolling collection of your last 1000 photos in the My Photo Stream album. From there, you can browse your recent photos or move the ones you like to your Camera Roll or another album to keep them on your device forever.

Because your Mac and PC have more storage than your iOS devices, you can choose to download all of your My Photo Stream photos automatically.

• In iPhoto or Aperture preferences on your Mac, select Photos (or Photo Stream) > My Photo Stream > Automatic Import. All of your photo stream photos will import into your Events, Projects, Photos, Faces, and Places folders in iPhoto or Aperture.
• On your PC with My Photo Stream on in the Control Panel, all of your photos will import into

  C:\\Users\<user name>\Pictures\iCloud Photos\My Photo Stream

  . If you're using iCloud Control Panel 2.1 to 2.1.3, the path is

  C:\\Users\<user name>\Pictures\Photo Stream\My Photo Stream

  .

Only if:

1). You backed up the phone

or

2). Had PhotoStream on. This ,however, will only "keep" that last 1000 photos. If had more than 1000 and did not back up, the older pics are gone.