Great portrait and subject. The stairs however are not the nicest complement to the picture and end up being a distraction. A little bit of crop to center and remove as much of the side railings would have resulted in a much better score.
While Michelle is gorgeous... the metal steps with a confused background underneath and behind them just isn't working for me. I'd love to see more pictures of her ... she looks very photogenic, so try some different backgrounds and poses and show her off here on the site.
The pose, lighting, and skin tones look good. The eyes look maybe a tad soft. I like that you've included some environment to set a mood although I find my head tilting ever so slightly to the right to straighten up the staircase.
Wonderful photograph. Her expression is relaxed and I love how her blue eyes really show up yet you weren't inclined to oversaturate to show them. Lovely soft light and great setting! It is a little bit soft for my taste but it's probably just the jpeg conversion. Anyway, a beautiful portrait.