Look at the picture of John Harrison painted by artist Philippe Joseph Tassaert. What is the best reason for adding this picture to Ship's Chronometer from HMS Beagle? to make the text more engaging

Look at the picture of John Harrison painted by artist Philippe Joseph Tassaert.

What is the best reason for adding this picture to Ship's Chronometer from HMS Beagle?

to make the text more engaging by putting a face with Harrison’s name

to emphasize that Harrison is the most important topic in the text

to help the reader understand Harrison’s chronometer better

to encourage the reader to appreciate Harrison’s genius