This isn't my area of expertise, but, personally, I only really like the first.

As there is so little foreground in the first shot, you focus on Stephanie. It's not immediately obvious that it's a staged flash-lit shot (unless you notice she's lit AWAY from the sunset).

In all the others you can see the light fall-off on the ground, which I don't like the look of, and distracts you from the two main subjects (girl and sunset). Perhaps they would work better with thin-DOF, with OOF-blur hiding the falloff on the ground, and with smoothly blurred sunset tones behind her. If you want to keep the details, perhaps two shots, one exposed for her and the sunset, and one exposed for the ground without flash, and merged in post.