I like portraiture, but I suck at drawing, so I have never ended up trying to create an artwork from scratch based upon someone's face, however I have always been a fan of Tim Burton and his style.
The way he represents the characters in his pieces is awesome and the way he goes about drawing is different to any other artist, but his naive and eerie approach gives me something to attempt to replicate if I decide to create a portrait style artwork.
Here are some examples of his artworks...