I like the third - shows a real woman under that lab coat - but I think the second, casual yet professional, is the best all-around. The first is good, but I feel the need for a little more space above her head to balance the image in the frame. Could just be my monitor resolution, though - a bit too small to get the entire image on screen vertically.
Very nice work. Thanks for sharing.
"Keeping shooting will do more for the excellence of your photography than most any camera will!" JimmyD, PGS Extraordinaire.