Pictures: what size?
 

Hello there,
I will be taking some pictures with me on my 1/2(half)RTW to Australia for paperwork I will need a pic for along the way, what is the size you recommend?
2"x2"? or is 45mmx55mm the most common?
By your experience...?

Also: how many? I was thinking about 20, too many? I am trying to sort out all the visas before departure by the way.

Many thanks in advance.

45x60 mm. shoulders seen, face looks at the camera, no side view.
I recommend 24 pcs.