What I like most about this picture is that it takes TIME for you to realize how sexy it is. At first, it's just 'Oh, shiny-haired girl in a dress, looks like she could be a princess or something.... and there's some spooky feathers in the background... and... holy crap. Those are her thighs. Her inner thighs are completely naked. I could stick my hand between those right now."
The only thing that bothers me slightly is th use of the extra-long sleeves. While this is not out of the question, especially not for a night-gown, this is an eas way for amateur artist to hide the fact that hands are really hard to draw.