Your exposures look good, but I would say #1 and #3 should have been shot with the camera in the vertical, or portrait orientation.
You even added a vignette in #3 to accomplish essentially the same thing.
More supplemental lighting would have separated your subjects from the background better. I can see a pin light on the little girl's eye which indicates you used an on camera flash for fill.
A simple way to make better photos is to get closer so the amount of background in the shot is minimized.