I've done this before. Several times.

As Vilters says above, it is a painstaking, time consuming process. The last time I did it, I charged $200 for the project and was throwing my time away. It took DAYS of working on that and nothing else, and when i was done I'm not sure the client was REALLY satisfied with the result. It is nearly impossible to get 100% there. Look at some of the "celebrity look alike" products here. Yes, you can tell who it is supposed to be... no, they do not look completely like the real life actors they are modelled after.

I'm pretty sure that is why no one is responding. It's why I didn't speak up when you first posted. It's just not something that's really doable with the current state of the technology.