I feel it needs something... I just made a zoomed effect to make it look like he's running fast, but it feels bland... Also, my fucking PS won't let me use text...
http://img410.imageshack.us/img410/9348/sonicsigd.png
UPDATE:
http://img503.imageshack.us/img503/5073/sonicsig.png
Added motion blur to Sonic, what else now?