This looks snapshot-ish. It might look a little better with a tighter crop but even then since you are really only seeing one face full on and a little side view on 2 others I'm not sure it would make it more interesting.
Definitely meets the challenge, and I like that there are even numbers of trees, and rocks in the background. Otherwise though, there isn't a lot here to hold my interest. The ladies all look pretty bored with the conversation from their body language.
Just seems like a regular out with family shot....not really a shot for this challenge....maybe if you zoomed in alittle, I want to look at this shot and just stare, wondering what their talking bout but right now i dont