Avengers: Age of Ultron - Previs
Chris Olsen has posted a reel of his previs work for Avengers: Age of Ultron.
Thanos VFX Breakdown by Luma Pictures
Here's a VFX breakdown by Luma Pitures, showing Thanos's appearance in Guardians of the Galaxy.
Avengers: Age of Ultron and Samsung Mobile present 'Assemble'
An entirely different team of Avengers is assembled in this commercial for Samsung.