The green backdrop is lovely. I liked that you used a shallow DOF to highlight the marble in the foreground. I also like the framing/crop choice. It follows the rule of 3rds and my eyes are not scrambling all over the image. I like that the focus is on the marble itself so you can see the inverted reflection. Only draw back to focusing on the marble is you have a bit of focus shift on the wire itself. It's slight blur is a tiny bit distracting. I probably would have sharpened it a bit in post personally. One other comment is it's a bit underexposed in the foreground. You couldn't have used fill light because of flash back but a little bit of dodge in post or level adjustments on the red channel could pop that marble out some more.