Well the whole point of organic modeling is to make things as realistic as you can. If you just crowd watch at the mall, you see that everyone has their imperfections. Try to incorporate some of those to help cross the 'uncanny valley.' For example: a rounded belly for those who have low metabolism/eat too much, crooked noses, a slanted smile, a few hairs on the head that just refuse to stay down.
I know this was mentioned above, but I'll stress it again. Stay away from turbosmoothing. With organic modeling, you should round things out by adding geometry yourself.
Edge Flow makes or break an a model, especially organic models. Look at some models of industry experts and see how their edge flow is different from that of yours and emulate it. Practice practice practice!
"If I have seen a little further it is by standing on the shoulders of Giants" - Isaac Newton
-Computer Animation Major @Baker.edu-