It compeltely depends on how you handle reflections, are you going to reflect a furtherly invisible environment? It may be very well possible to have green around the highlights on the right, and lots of blue coming from the top. The scene could be in a dark cave, creating this dark tone, with the highlights being blue from the sky visible far away, or more red from some torchlight. You can go everywhere with this, as it is metallic and reflective, yet not perfectly smooth enough to reflect clear shapes and images. There is freedom in this which you should try to grasp entirely, and then choose what you're going to do. There are nog constrains, who knows your armour is made of chrome, and everything is (nearly) 100% reflective, or perhaps it is painted. You don't have to decide on that yet, as basics can (and probably should) be finished first.