I rarely try to draw anything realistic - that is - with chiaroscuro shading and a nose that more than one line. However, I noticed a great artist Bum Joon-Kim, owner of horroranimation.com draws a lot of things that are really realistic with an anime flair. And although he might not admit - are actually quite excellent.
So I toyed around with shadin and came out with this in around 7-10 minutes in class one day during a critique.
Today, I was in class and drew one of my own characters, Amy Muranaka. Eyes aren't asian enough, but I do actually like how this came out. Except the lips - and the neck. Still too stylized, but it's GETTING there!