The detail in this is absolutely amazing!

The strands of her hair, the dirt on her skin, the veins that you can see through her skin and which make her skin look almost translucent!

I also love the texture of the marble! Did you paint that al or did you use some kind of 'marble'-brush?

Also the texture of her skin looks so real. It looks like you added noise, but also like there's some other texture or brush. (sorry for being so curious!!)

And that bright bit of clouds in the top left corner make the brightness of her face op out even more!

Overall, great atmosphere, composition and technique, you've got a lot of talent!