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At the moment the photos app only seems to work with iCloud shared libraries. However, you can use HomeShare on your MacBook in iTunes to share your entire collection from the Photos app on OS X and access it via the Computers app on the Apple TV.

Thank you for your information.
I will be praying for a update that permit access directly from photos app. The auto-slideshow is great to view our albums with friends and family. But it's annoying to connect MacBook everytime!
 
Thank you for your information.
I will be praying for a update that permit access directly from photos app. The auto-slideshow is great to view our albums with friends and family. But it's annoying to connect MacBook everytime!

I definitely agree with that. I had hoped that the Photos app on the Apple TV would work just as it does on iOS and OS X. I'm shocked that it doesn't as its now the only Apple device I have that doesn't automatically keep all of my photos in sync. Annoying.
 
Well, it's official. I'm not buying Apple TV anytime soon! hdmi cable will still part of the family for now... lol
 
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