B&W conversions aren't always a cure for a bad photo.
What I want to be able to discern is what that object is that is impaling her forehead. I even put on my glasses and can't tell what it is. You've cut it off with the crop which has, in essence, made that element superfluous.
IMO, a B&W image would be appropriate with this subject. However, your PoV is off, in my mind. I definitely envision a shot from the other side where the grafritti is part of the framing, but the annoying metalwork is out of shot, leaving some empty bench left. It looks as if the doll could be placed on the left vertical RoT line, prominent in the frame, yet breaking the "rule" of giving the subject space to look towards at the same time.