I love the atmosphere but I can't figure out what's going on. Did they lose somehting? Are hey waiting for something? Are they commiting sucide? There is not enough character expression to confirm or deny any of these guesses I have made. It needs something subtle to suggest what;s actually the theme of the image. Maybe a mannerism they have or possibly an object such as a space ship? Something not too obvious but still visible. I don't want you to add anything that would take away from the feel of the scene, but I do feel it needs something more.