light is hitting the bottom left part of the planet, so going by that, i suggest you give light highlights to the bottom areas of the ship, as if there is light coming from the bottom left side of the image. if you render the model in a 3d modelling program, this will become even easier to do, since you can dictate where you wish to place the spotlight in order to brighten up the model.
When you crop the image to create the render, use the polygonal lasso tool, zoom in on specific areas and slowly bit by bit manually do them, when you use the magic wand as you have here it leaves unwanted bits here and there,and Blurring/Smudging them dosent work mate.