I never thought of my little FZ-1 as a studio portrait camera... but if you didn't tell me these were taken with that I would never known, or guessed. These compositions are excellent. Proof positive that the skills of the photographer matter more than what camera s/he uses. Everything to my untrained eye looks fine. Third is my favorite but like them all.
The your model has a beautiful face by the way. Nice, nice job.
Post some more, please!