I found this exercise on Deviant Art from one of my favorite artists (Tessa Stone. She has an awesome online comic: http://hanna.aftertorque.com/) The goal of the exercise is to establish a consistent look to the character from all angles. This was more for fun, but in the end it really solidified Punch MacBolt's look for me.
If you've got a character you'd like to nail the consistency of, or if you'd just like to challenge yourself to draw a profile from so many angles (some of them can be quite difficult if you're not used to drawing these angles,) here's a link to the blank template to download: http://vert-is-ninja.deviantart.com/art/Consistency-Exercise-Rainbows-144680987
