Read the excerpt from Into the Unknown by Stewart Ross, and then look at the image below.

Among the earliest Europeans to show an interest in Africa beyond its shores was Joseph Banks, the botanist who had sailed with Captain Cook. Many others were inspired by him, including the Scottish doctor and missionary, David Livingstone. Between 1854 and 1856, Livingstone made the first recorded east-west journey across the continent—from Luanda, the capital city of modern-day Angola, to Quelimane, a seaport on the coast of modern-day Mozambique. On his return, he wrote a best-selling book, Missionary Travels, in which he described a country quite different from that which his readers had imagined. Instead of bare, arid desert, he wrote of rich tropical forests, lush plains, and spectacular rivers like the Zambezi. Europeans learned for the first time about the Zambezi’s Mosioa-Tunya Falls, which Livingstone was the first Westerner to see.

A portrait of Joseph Banks.

How does the image help the reader better understand the text?