What is the primary focus of the section in Kalpasutra that is often illustrated by artists?

Lives of the 24 Tirthankaras

Answer: Lives of the 24 Tirthankaras

The primary focus of the section in Kalpasutra that is often illustrated by artists is the lives of the 24 Tirthankaras.

Among the most widely illustrated canonical text in the Jain tradition is Kalpasutra. It has a section, reciting events from the lives of the 24 Tirthankaras — from their births to salvation — that provides a biographical narrative for artists to paint. The five key incidents roughly elaborated as — conception, birth, renunciation, enlightenment and first sermon, and salvation from the lives of Tirthankaras and events leading to and around these — comprise most part of the Kalpasutra.