#1 - The guy looks like he has a bush growing out of his head. The woman would be an interesting model alone, with her colors (scarf/clothes...), which are really strong. I do really like the juxtaposition of young/funky v. older/traditional, which I assume you were trying to display, but the composition isn't working for me - the photo has too many things in it that are distracting or just don't enhance the shot, like the woman behind them and the landscaping. Old and Young on a park bench by themselves in B&W in front of something simple (a wall, a blurred building, a fence) would highlight the differences between them better, for example. And lastly, her pants are suffering from the too-bright sun. Try early morning or early evening for better lighting.
#2 - I like this one. Nice sky.
#3 - This one is ok, but not as appealing to me as the second one. It looks like the building has some nice architectural features I might try to get closer to - the building has potential if you are going back to that location. Also, this one seems a bit softer than the second one, but perhaps that's just me.