I could get lost in the harmony of black lines everywhere, and rest in the patches of bright white or pools of black. This seemly generic everyday event is exceptional because you captured this girl, her outfit, in a specific movement/moment, framed by the people, stairs, and architecture. Even her shirt adds to this. It's how her frames echo all the other black rectangle/square outlines. The man's lanyard also connects with the more organic shapes in the plaza. I think what makes this picture is your connection with the original artists vision imbedded in the plaza.
I really like where some of your more recent work is going; connecting real life and real people to the artist that created the space or artwork the people are (accidental or intentionally)involved with. I don't know if that's your intent or not, but it's something I noticed. Here, I bet few people notice the thought that went into the design of this plaza, but you're bringing it back to life, and maybe opening the door for more people to understand art.