HI Brittany,
It looks like you're making some progress with your full length portraits and 'studio' shots.
I can offer a few suggestions. I would pull the subject further forward from the background but I would also consider using a different color background for a shot like this. My reason would be because there is black in the shorts, top and shoes and had you actually rendered the background black you would not see much contrast and your subject would just be a face, fingers and legs. A gray or white background would work much better to get separation without the use of additional hair or accent lights and would also let us see her black dance shoes, which for me, add a lot to the character of a photograph of a dancer.
Your main light looks pretty good but to my eye it could use a bit more fill to not only open up the shadow side of the face and her right eye, but to also fill a bit under the chin. Depending on the size of the modifiers used I would try to get a bit more fill towards the bottom of the image so that the calves, ankles and shoes are better lit.