Wow...I wasn't paying attention to the artist name when I clicked the thumbnail, and I thought it was a real model! The most convincing part to me is the way her body doesn't have any sharp folds, and curves nicely everywhere.
It took me 2 years to realize the importance of lighting, and another year to get a better understanding on how to get it done right. Still, there is lots to learn about it - and many other 3D artists I have seen here don't take it as seriously as they should, because they are thinking too much about 3D models and poses.
I agree 100%. Modeling and posing is all technical, in my opinion, but when you get into the lighting and texture interactions is when it becomes art. Sometimes I want to post screencaps of my engineering work and claim it as art just to be a smartass!