I think that Dad was probably saying to so down rather than hurry. Construtively: subjects are blurry, I think I would have cropped it so there wasn't so much ground in front of the subjects since the background was sharply in focus
I don't like looking at people from behind. A person's story is in his or her eyes. You could have snapped a "candid" shot from in front of these people...candid is not necessarily "secret" or "without being seen". Could have used a little bit more depth in the photo too, maybe another angle where the street plays more of a role... Photo a bit soft too, maybe wrong shutter speed?