June 11, 2008 -- ViVi says,

Question #1

I'd choose the Deimos's frame, #21, because this shot shows us the environment and where actually the story takes place.

Question #2

And my second frame is #3, because it shows the main characters and the poster what they are looking at. We also can get some information about young boy and old man, how they look like, their ages and, probably, their mood.