a neat trick for starting with a good base for a face is this.
visit the sites that show mugshots

eg: mugshots.com
get the front profile shot
load this up into your fav 2d package
create two layers of the same face image and make the front one 50% opacity
working on the back layer use similar filters like trace edges and find edges to make the back image more posterised.
this will result in an image of the face that resembles a painting created in the impressionist era.
from here you could collapse both layers and start painting directly over that new image or using another layer on top, paint the new face as using the previous two layers as reference.
nudge or smudge tools greatly help to modify the original face if you want to say convert a mean looking mugshot into an ogres face as an example.
If no-one gives your an answer to a question you have asked, consider:- Is your question clear.- Did you ask nicely.- Are you showing any effort to solve the problem yourself