It's a nice image. A couple of observations: The glass looks a little bit like it's floating in the image. I think one partial reason for this is that the ground does not have a distant boundary. There is no point where one can differentiate between the ground and whatever else surrounds the glass. It also seems like the glass is a little bit too opaque. Just out of curiosity, what kind of system are you running to do this work? - Chas