Animated zoetrope records
Animated record zoetropes (side note: trippiest stuff courtesy of Bonobo towards the end)
The rectangular shape of the postcard will be an issue for creating a continuous animation, though as it's supposed to be a 'tourist' postcard, keeping the design to a circle and having space around it, shouldn't be a problem.
A Portrait by Aristotelis Maragkos:
Not a circular animation, but could be a style that works well.
