I had so much fun doing portraits for the current 4th year (and a few 3rd and 2nd years too) medical students applying for residencies. When I do portraits, I keep things simple. You don't need a fancy light set-up to take amazing portraits. I always used natural light, especially window light, and then fill with a reflector. Done.
I love shooting at Brown Medical School because the 3rd floor is a natural light box of windows and provides an equally beautiful background. With some simple post-processing in Lightroom, these portraits turned out fantastic.