Lips Modelling

razfoil

I'm designing a high poly female model in 3ds max and have made quite good progress (this is my first proper project), but i'm struggling to get the lips to have any definition when a smoothing modifier is applied :L
any help is much appreciated

(project photos attached)
http://binarydesign.co.cc/web_images/lips1.jpg

http://binarydesign.co.cc/web_images/plusbody1.jpg