Ah jeez, i'm not good at critisizing, i've never done it before... Here goes...
It's really, really good!
A part I really like about it is the bloom. That and the fact she isn't a pegasus gives her a godly feel, which I really enjoy. The ancient Greek/Roman feeling is very well executed here.
The only thing that bothers me in this picture are the columns. To me, they look out of place because they're not darkened like Virgo is, but that may just be me.
Other than that, excellent job! I hope to see more like this from you!