Take the dots out of the rocks and youd have a killer piece. Right now, to me at least, they are only adding noice. To that, the textures on it dont actualy look like rocks. Other then that, beautiful lighting dude!
It looks cool except for the mossy cracks in the rocks which look really overdone and unatural and the noise on the plane. It looks more like rock than rusted metal if you ask me. But the back enviro and lighting is really nice.