This is not the sharpest picture I have ever taken, but it is one of the most evocative. It's about communication: literally, about reaching out and touching someone. That's why I chose it for the home page.
Admittedly I'd be happier if the top of the bollard wasn't so fuzzy and messy (I cloned out the messiest bit), but I like the way it stands between them. She's nearer to it than he is, as if she is drawing closer to him. Take the bollard away and the picture is much weaker. This is often a good way to analyze a picture: imagine removing the "faults" and see if the picture is stronger or weaker without them.This is why I'm not sure about the graffiti in the background, but I think they add to the picture. The same is true of what I imagine is a ventilation grille. Imagine the background as plain, clean yellow and it takes away the urban "edge" that overcomes the technical shortcomings of the picture.