First off, she is really beautiful! I really wanted to look at this photo because her eyes drew me in from the thumbnail!
Vision- I like how you took this and even if it be spur of the moment photo, it looks like an amazing photo from an studio. Great work!
Originality- I will admit, there are so many photos of girls/women faces on here that it is hard to distinguish one from the others. But her eyes make it very original and when you move around the room they follow you.
Technique- I love the softness and glow she has. The bokeh in the background is making her pop out like they are stars pushing her forward to be the main star! I like how you put your ISO settings on 640 to bring out some noise and detail in her hair, not alot, but just enough to know that this isn't a painting. And the fact that she is not centered. I love the rule of thirds, makes for interesting photos and here it seems like she is almost spinning into the other empty half.
Impact- I love this and I hope to see more of your work because you have a great eye for taking photos of people! Keep it up!