Fantastic, but is it a prototype?
This is an amazing piece of work. Beautiful, this is deserving of the category Fine Art. The colors blend well, the light shines off the armor, but there are flaws.
The forest looks more moss than greenery, try making lines to indicate leaves and branches, and the trees seem to end without roots. The work on the robots is fantastic, but the forest just isn't alive. And why is the guy in the back holding his gun like that?
But really, I like it. Just needs a few touches. Give it a few more hours. If you really want to make this worth a 10 rating, spend a afternoon on it.