Very nice work. It is cool to see a different take on it.
Personally I do prefer the look of some grunge, oil, dirt... I think that's part of what makes movie miniatures work so well and look so convincing.
With the super clean and even tones it somehow looks more "toy" like to me, less "real".. If you catch my drift. :/
Just my personal taste though, I do appreciate the work you've put into it. Nice work indeed.