Why did Leonardo da vinci do art?

From a very early age, Leonardo is said to have shown exceptional ability in geometry, music, and artistic expression. Noticing this, Ser Piero took his son's drawings to Andrea del Verrocchio in Florence. Verrocchio was so struck by Leonard's brilliance that he immediately took him in as his apprentice, and by 1472, at the age of 20, Leonardo had joined the painters' civic guild in Florence.

Answer 2:

There is usually one and the same answer to those questions 'Why did XXX become an artist?' Because they felt they had the talent and the urge. It is as simple as that!