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i appreciate everyone who replied to this thread and gave their own efforts and ways. I tried doing the "posterize" method and also tried doing the "cutout" filter as well and then applying gradient maps. The only problem with that is:

* the picture should be very high quality

* the lights and shades should be very precise

* it discards the facial details such as that of mouth, face and eyes.

The only possible way that i was thinking of, same as told by "chrisdesign"  that is the only possible way for you. One has to draw the lines and shapes on whole picture and then applying gradient map is very easy. It has to be so many shapes and so many layers. It is a time taking process indeed. I would try it some other time.