The linework is pretty smooth, but the anatomy could use a little work. The head is a little mis-shapen. I thought at first that those purple things were supposed to be weird shoe things and that looked weird, since the body just fades off into nothingness. It's unclear and ambiguous what's going on there.
No offense, but this looks a lot like a Sonic recolour (the eyes and mouth area, namely). Just because it's a Sonic universe character doesn't mean it can't be different. Also, no offense, but the tentacles look phallic.
Keep up the good work, I see a world of potential here!