Tiamat indeed! I think the green works best in this mini -- really gives it a "dragon scale" effect that pops on your mech. The black and red seem a little off (not by much, just doesn't have the same effect as the green.)
This is a good entry, that is minor details away from being great! Antenna, and a cleaner + more interesting base would have kicked it up a notch. Great paintjob though, esp. the green as Peddler said.
A solid concept, but the lack of lining in the red areas combined with the lack of accentuating color for the joints and barrels detracts from the impact of the piece IMO
Maybe it's the lighting, but some of the scales seem much better highlighted than others. I love the idea and you've done a great job with it. I would have liked to see the pair of antenna, though.