The lips looking strange thing is partially a mapping and texture thing. The lip material zone on the uv maps goes a bit into the philtrum area and those particular textures go up into that area. If you compare them to SaintFox's textures, you'll see what I mean. Hers don't go up into that area and thus don't look the same. I'm working on a number of lipsticks  and I've avoided going that far up on the UV map because at certain angles it just looks "off".