Classic Sonic Sprite Sheet. How does it look?

[Cloud6625]

This is definitely a good improvement over the original. I would say he's just a tad too chubby, the spike coming from his back is a bit too thick and you could use a bit more contrast with the highlights. Other than that, it's fairly nice. I do kind of miss the lighter pallete you were going for. If done right, it could've been a very unique and interesting new palette for Sonic.