In the fifth one, the light reflections are more intense, the edges of the lips are more refined and there were some details added at the top of the lower lip, also some other minor changes... you are welcome
NicaRox2006Featured By OwnerAug 17, 2013Hobbyist Digital Artist
If you'd allow me to give a word of advice: what I would do is not add shines. Of any kind, and make the color more opaque/matte rather than glossy. As for the color itself, I would say something dull rather than bright.
I don't say anything about the thickness or thinness of the lips, that's all up to you haha. Some men have really nice plumpy lips. Yum.