I agree with Eric about the marble. It is a little strange. I often get marble tiles from here

http://www.grsites.com

Then have heaps and many of them work really well in Vue materials.

My only other nitpick, and that is what it is because this is a gorgeous image, is that the water in the pool ought to be still. It looks a bit wavy, and it would have to be pretty windy to get waves on a pool that size, but there is nothing else suggesting wind in the picture. The grasses in the vases are quite undisturbed.

But this is a wonderful image - very calm and peaceful, and a nice mysterious ruin.