Talking to reporters here, the artist Ashok Nagpure, said, "Amitabh Bachchan is a very important and popular personality in India. It took 72 hours for me to create the sketch."
The sketch will be presented to Big B in Andheri next month, he said.
Nagpure is an engineer and is presently working with the Maharashtra Engineering Research Institute (MERI) in the city.