Looks like a great first shot for sure! I do notice that her eye on the right (her left eye) looks a bit odd because the lashes seem to form a sort of black little blob. Maybe that could be retouched a bit?
This is really well done for it being your first try at using a studio. I've heard from other photographers that getting lighting in a studio setting requires that extra bit of adjustment compared to natural lighting; the shades of grays in the background show a very interesting contrast of light, so I'd have to say you did yourself a fantastic job.