Thanks, all. The original image + comments..
Thanks to everyone who commented. Per Asher's request, here is the original, unedited (all I did was resize) image. If anyone wants to have a go at editing this image, feel free to do so.
I have to admit I don't usually do a lot of post-processing work on my images (just the usual PS stuff) and I really didn't go into my original edit with a plan of attack. I just fiddled until it started to look like something interesting. I think this particular image needs a little more premeditation and I may do another edit from scratch.
To answer some of the questions that have come up:
1. Trust me, there is nothing more interesting on either side of this diner. The kind of structures you see in the background are on either side. To the immediate left of the diner is a trailer (with the ice cream sign) and a car parked next to that. That's why the framing is so tight (my original edit really doesn't crop that much from the original).
2. I agree that getting closer and using a lower angle might have helped. The problem is this diner is on a busy four-lane street. I toyed with the idea of moving to the grassy median seen in the bottom of the unedited frame. But that median is not as wide as the shot makes it appear and frankly I didn't feel it would be a safe thing to do. It was early Sunday morning, not very light yet, and there was still a fair amount of traffic. The best vantage point would have been in the middle of the street. But I don't think that would have been a healthy thing to do. I also thought of shooting from the sidewalk in front of the diner, but I'm not sure I could have gotten enough of the diner in the frame (24mm was the widest lens I had in the bag).
3. I agree with Don that the woman in the left corner of the diner is interesting and could be the subject of a different crop of this image.
Tom