Ninja Nathan's Sprites 'n Stuff.

[Zee]

Also, this might help you out too. Study the way the light falls on all of Ridley's curves and shapes in the Prime Series or MZM to get a better idea of his shapes. You currently have domed shapes. He's got more of a ridged face and his eyes are hard to see from above. Also, I suggest shaping his body in general to be more than just rounded ovals.

Good luck, I hope you take our advice to heart.