I'm going to guess that your score might be a bit low due to Did Not Meet Challenge voters as most don't consider black as "light"; the stockinged legs do indeed meet the challenge, though. Pretty good job with your set-up, though I, too, can see either something she is standing on, or something you didn't quite edit the same way as the rest of the background. I'm sure this is quite monitor-dependent - I can't see it on my laptop which is a bit overly bright. In the future, with shots like this, try viewing on several monitors if you can.
The overall effect of the photograph is one of clean, crisp presentation for the most part - as someone else mentioned it would make a good catalog shot to advertise the shoes.