All sorts of effects are possible with multi-layered shaders controlled by mask images. Lipstick, lip liner, eye shadow, tan lines, stockings, french manicure - tons of stuff is possible.

I demonstrated many of these in this thread:

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2772463&page=1

Have a look on page 3 to see lots of lip treatments, all using the same default texture set.

I never got that product off the ground because I had to solve the problem of making these shaders work with any texture set. That led to the creation of VSS.  Since then I pretty much just stopped working on it.

I'm tired. yawn I should go to bed even though it's only 8:35 pm.

---

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)