Onyx wrote:More rim lighting (is that light facing the camera or the background?)
Neither. It would be a light pointed at the subject, usually from the rear, aimed at (say) their back and shoulder area, or perhaps their hair, in order to highlight their shoulder and separate it from the background. Probably should be very slightly over exposed, and it provides a "rim" around the edge of the subject of the photo.
Matt, the lighting is way too harsh; are you using it direct and undiffused? You need to soften it quite a bit. Move it further from the subject, and introduce something between the light source and the subject.
Perhaps turn the primary light around and point it into a silvered or white brolly, for instance, noting of course that this action will affect your exposure.
The background lighting too is too harsh, and it looks to me as if there's very little distance between Sam and the background, with the light source sandwiched in between, probably jammed up against her back.
Again, the light source needs to be more diffuse, further from the subject, and probably truned down a stop or two. For the moment, to me, it's just little more than a hot spot.