The composition / arrangement on the first photo is a bit of a mess. She's center right in the frame, which feels really weird in relation to where she's looking, her leg is cut off awkwardly (as Baark points out) while there is way too much room above her head. The exposure for her seems pretty good, but the background is a bit distracting in the way that it's lit- there's a bright streak to her right, for example.
The second one is ok composition wise, other than that leaf hanging down in front of her forehead-- that's the kind of thing to watch out for when you're shooting. The way that that leaf and some of the others to the right are illuminated are really distracting, and compete with her for the viewer's attention. The lighting is also at issue here in that her face is pretty oddly lit and is underexposed relative to the rest of the image. The background is really dark off to the right, which throws things a bit off balance.
Number three is out-of-focus-- not badly so but soft enough on the eyes that it's distracting. At the same time, it's just... muddy. It's really dark over all, and the background, in particular, is murky and distracting. Her pants are also just a mass of black.
Also, for all of the images she is wearing an identical expression. If the photos are intended for her parents, it might have been good to coax something less somber from her.
My greatest reaction to these photos is that you really need to work on balancing ambient and strobe if you're going to do these kinds of shoots. The interaction between flash and daylight is problematic in every image. It might do you well to back off and start working with just one light, and master it before you expand. You need to work on lots of different things, though if I had to name the first, it should be the fundamentals of composition and exposure.
Sorry to be blunt, but one blunt critique will help you more that 500 positive reviews.