When i looked at this i couldn't help but think wow this would have been kick ass as a cool pixel art render for something like one of the games. (could you imagine how much of the programming something like that would have took up?)
Now that is an awesome looking Metal Sonic, you did a good job with the "cel/toon-shading" style, while still making him look metallic, and robotic. The 3D model looks very accurate to the games to. Great work.
Ow wowa , nice modelling work on metal once again , He is looking epic ! I love so much how you make him everytime and this pose really is fitting him wel! Great and epic job on that! also the shading is very original!