Until iCloud Photo Library makes its official debut on the Mac with the all-new Photos app next spring, the only way to access those images on OS X is via the iCloud.com Web app. Of course, if it's just the most recent images you want to see on your Mac, you can always view your Photo Stream on iPhoto; it downloads the last 1000 images you've taken or uploaded on any iCloud-connected device.
But if you'd prefer not to open iPhoto every time you want to view, download, or share the latest picture from your iOS device, there's an easier way: Myphotostream.
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