Nice photograph. Not sure if the frame helps or not. How would it look if you cropped the sky out a bit for a semi-panoramic feel? A bluer sky might have gone better with the colorful grass maybe?
This is a good photo, but it is hard to believe that it is a candid.. I don't think I have ever stumbled on two people sitting in the middle of a field like that before. ;) I will give the benefit of the doubt though
Looks like a scene from a movie. If you have the resolution you could try a much closer crop on the couple. The field doesn't appear to have any flowers or anything to look at besides lots of grass.
I like the shot but I'm not a fan of the border. It kinda stops the eye and then lets it go for a second before its stopped by the real border. I had a quick peek at this without the border (just dropped it into PSP and removed the border just to look) and I like it a lot better without it.