Great contrast, and I like the title. It's quite fitting, all standing in a line, looking pretty much identical (though not quite).
The shadowing effect on and beside the dominoes is really interesting. How did you go about that? I'm undecided about the tree. It seems to fit and yet be entirely out of place at the same time, to me. I'm not sure why. It sort of makes me think of a mourner, someone watching the soldiers move off to battle or something of that nature.
The contrast is excellent for this, and overall it's quite a thought provoking image. Nice work.