One of my favorite things about using off-camera flash is that you get to keep those gorgeous blue sunset skies in your image instead of blowing them out. Here, Kamila's back is to the sun, providing a nice rim light, and her face is lit with the B1.
Sometimes shooting outside with lights can be confusing. Most people are used to shooting natural light, and wonder how to add flash in to the scene. Once you set your exposure for the background, you need decide where to place your light, and what power the light needs to be to create the desired effect, and from there it's fairly simple. It takes practice to be able to keep up with the constantly changing ambient light conditions that the golden hour creates, but everything worth doing takes practice! So, that's what we did: we practiced.