sorry for not throwing my 2p in here;
it's an excellent base mesh, its got a beautiful flow, but I'm not too keen on the z-brushed one.
firstly, the breast have become too flat, it looks like you either need to make them more extreme on the base mesh and then re-smooth it or make them more pert in the z-brushed one. The same seems to be true for her bottom too. The original Venus was a bit curvier than yours.
the cracks and scratches on her body look pretty blurry and out of place, maybe look at where the stone might crack naturally.
It all kinda looks like you skipped a detail pass in z-brush, it's too smooth and too rough all at once, there's no definition around the abs for example.
still, all together better than I can do, i could never quite get my head around z-brush.
Manic
I don't have a sig, live with it.