This is a very interesting picture. I like how you drew Amy in her werehog form. Considering how the werehog was done in Sonic Unleashed, I figured you go the same route, but I like your take much better. I like the look on Amy's face. It suite her condition very well. I also like hoe you've completely destroyed her dress and her boots. She's a true monster. The muscle tone was also well constructed. It's a great contreat between her normal form and her werehog form. Amy is a true werehog as far as I'm concerned. Very nice work.
Nice work, though it feel like it's somehow minus the charm of your original sketch. I realize this is the transformation undergoing its initial change where as the other is her already fully chnaged. This just feels different somehow.
Know what I realized? Calling it a "Werehog" isn't right: she was already a hedgehog, so that would mean she's turning into a werewolf... I know, that how they call in the game (I've heard) but still annoys me a bit.