A different interpretation of the picture:
Tom seems... maybe frustrated?
Holly & Scott look uncomfortable.
CDKT look tense... well, Tara and Charla do, anyway.
It's just hit Beau that it will likely be Melanie going home.
Amy is just standing there like a dip sh*t, too stupid to realize any of her people are in jeopardy.
Here's a shot in the dark:
They are still in the process of selection, explaining why Des and Mel aren't shown. Even though Des is first in line-up, they told her that she has to pick LAST. Being that Tom is the only one left, and Melanie can pick before Desiree, Tom is a little freaked thinking Melanie will come to him and so will Desiree, putting him in the sore position of sending one of them home. However, Scott and Holly are paranoid that Melanie will walk over to them, hence their looks of discomfort. Beau and Amy look less than happy (though I still think Amy's stupidly smiling--maybe the resolution on my computer) because they've realized that one of their posse will be leaving, no matter how you play the cards. I'm still thinking that the twist is that the evicted guest gets to pick someone of their choice to leave with them--which could be why DCKT aren't looking super happy, either.