We cannot legally do a likeness doll in an exact likeness of any person, celebrity or otherwise, without their explicit consent.
If the person is deceased or fictional we would need consent from their trust or licensor. We can, however, use photographs of a person of your choice to select a face structure as similar as possible from our line of hundreds standard female faces. If we have a face with similar structure, we can match make up style, hair style and coloring to the person you are looking at and make a similar looking doll.
We have done this with good success in the past. If we were to create a doll with a similar look from one of our standard face and body combinations, the price is the slightly higher (contact us for exact quotes). If you can get the consent of a person to be made into a doll, we would need him/her to come to a facility for 3D scanning. We could either do just the face, or complete face and body. The cost and time investments for entirely custom projects are very high and depend on your requirements.