This is a challenge and an exercise that I find incredibly helpful when hashing out a new character. It's good to have nearby when doing your panels and you're thinking, "Damn, what does So-and-so's nose do in this expression?" Or maybe your drawing isn't consistent and you want to keep a certain look? Catalogue them on this sheet first and keep it nearby for easy reference!
I'd be more than happy to see filled out sheets in other people's devs! Let me know if you do post it cause I'd like to see it!
EDIT: Fixed typo, took away 'surprised' and replaced it with 'tired', then added 'surprised' to 'shocked'. I want to thank the forum folk at girl-wonder.org for the suggested changes!
EDIT the 2nd: WOW. This thing has taken off! I will read all your comments eventually, it'll just take me some time! The Tutorial
that this exercise sheet goes with. Enjoy!