Wow. I sculpt actual model figures, and a lot of the same techniques apply there as well. (Unfortunately I've always wanted to start CG but never got the chance.) In my sculpting experience I've been fortunate to meet many world-class modelers. What they have said, and this is definitely true, that people always look like who they are supposed to be based on their hairstyle. When I am trying to make a specific character, there is so much you can do for the shape of the face, but if you get the hair just right anybody can recognize that person. Its a little easier for me because I do smaller scales, but once you put some hair on, your figure will always look a lot more feminine. I've annyoed my friends and family to no end asking them to stand still so I can see the shape of their eyes and noses, but it all helps. Try to look around you whenever possible. Great job everyone.