Little black rectangle of a photo in a poster within a poster = very meta.
The Violist wonders what the Cellist finds funny during the 2nd Violin's introduction.
Finally getting down to the playing,
with the serious teacher face,
"I am viola hear me roar"
wandering eyes wondering
All smiles after the serious second movement of Shostakovich F Major Quartet.
The big picture, behind the audience's back.