I love looking at screenshots of apps and services to see how they work, what sort of information they expose, and what sort of value I can get from it. The screenshots you've got in your carousel look interesting, but they scroll past too damned fast. There's no time for me to investigate the screen to pick out details.
I'd love to see manual paging through those screenshots with some words describing what I'm looking at, but I'd settle for a pause button!
One other thought: have you experimented with reversing the order of the faces, so it goes happy-meh-sad? I feel like I'm drawn to the sad face most, though that could be because the colour of it contrasts with your very green header.