Ok, well, that's a start. I can see the changes you made for sure, one thing to be careful of is making things too square. Try to made the quills rounder first.
No, I made this sprite all by myself, trying to make the same pose as the sonic advance 3 one. But I took the foot from the running sprite to look like hes sorta jiggling his leg. and one hand on his hip.
Detailed...
OOOOOH THAT YOU ONLY MEN'T WEEELLLL~