From left to right:
Metroid: Thinking of spam and how it tastes...
Griffith: Waiting for an opportunity to usurp the Crimson Beak's ultimate power
The Crimson Beak: Content with is vast power and collection of minions
Marth: Smiling because he's fairly sure that he's the prettiest
Hayato Falkner: Feeling like the combination of three pretty boys will make the chicks go wild and he's grateful to be one of them