This isn't exactly a tutorial but it's very interesting. Basically it's a YouTube video showing 100 ways to draw manga eyes... everyone has their own style of drawing these so maybe you can develop your own by watching a few examples.

http://www.youtube.com/watch?v=KYHzcM32f1I&feature=user

This will be moved to Tutorials under "Eyes" shortly. =)










All copyrights to this video go to Mark Crilley, I did not make this video nor do I claim rights to it.