not a bad set overall, but they definitely could have benefited from some flash.
#1 is not a keeper in my opinion. It is underexposed, and the uneven shadows across the face are very distracting. It would have been a great shot with flash.
I like the idea behind #4, but I think they either should have both been looking at each other, or both looking at the camera.
in #3 and #4 I think I would have cropped a bit off the top, down to that white line (a road?) and cropped it out of the image.
I would tone down that watermark a bit. it is too big a presence in these photos.