Where does iCloud store my photos on my PC?

If iCloud is a replacement for me connecting my iPhone4S to my iTunes for backup and downloading my pictures on my PC. Then where are the photos that I backup to iCloud with my photostream on in the settings of my iPhone4S? When I go to iCloud.com, there is no Icon to see the photos that are supposedly backed up. This is a waste of time for me, and the money I spent to get more storage if I have to connect my iPhone4S to my PC in order to backup my photos, and to see my photos on my PC.

Any help is greatly appreciated.