I was cruising around the web and came across this fantastic blog hosted by AAU character design instructors: Jennifer G. Oliver and Mike Corriero.
The link is a post that explains the hows and whys of character sheets (turnaround, expression, posing, etc...) and how one may create them. Character development is so integral to what we do -- I'm geeking out just looking at all the ways someone can move.
On further perusal I realized this blog is a treasure trove of incredible information. Please check it out and click on random things. There's so much to learn in this one resource I felt like I had to pass it on.