Heh, I'm makeing a Silver WAD based off of Chrispy's work as well. Coincidence. :P
(took a screenshot because I'm too lazy to change the color I used for him (orange) to silver. Why orange? That's one of the only color sets he doesn't normally have on him, and he has green on his boots, white/gray on his boots/mane... you get the idea.)
I sure hope you don't mind me continuing, even though we're basing our sprites off the same style, but tbh I didn't know you were making a Silver until just now XD
Also, a bit of friendly critique:
His front quills don't all spike straight up. The bottom ones point out to the sides.
Remember, Silver wears BOOTS, not sneakers, so make sure they look like boots. :P
Also, I seem to notice his two main quills have a dramatic change in the different angles, but maybe that's just me/the fact it's in an animation.