GameCube Analog Stick

WIP - I've been wanting to get into icon-making for a while now... This is really my first attempt at realistic shading and replicating a real object. Created 100% in Adobe Illustrator - because I'm more comfortable there; though I'll likely bring it into photoshop for any detail work in the end.

Any feedback would be awesome - lay it on me, cuz I don't know a ton about making icons.. I want this controller to be a replacement icon for Dolphin.