Are you talking about the basic form and proportion of the lips? If so, I have a hell of a time with that too. But if you're talking about the little wrinkles and fine surface details, I would guess that most people just use alphas in projection master to accomplish those.
I really like your Silver Surfer, btw. I agree that your character's anatomy is not at rest, but it's very fitting for a comic character and especially for a guy who is forever balancing himself on a levitating surf board. I bet his muscles hardly ever appear at rest.