The facial expressions in this show are terrific. The way we see Ai's complete thought process when she gets the phone call from Miyokichi (ep7, around 10:35-10:50) is just great: disappointment, inspiration, pondering, feeling a bit cruel, determination, and maybe some shades in between.
Good discussion of facial expressions in this show in the "
stone and small ripple" blog, as mentioned in a good piece in the "
end of the world" blog.