Leonardo Da Vinci is quite the man, he had popular interests not only in art but in science, engineering, mathematics, sculpture, architecture, and anatomy. That’s just to name a few. He popularly made artworks like the Mona Lisa, the last supper, the Vitruvian man, Saint John the Baptist, Salvator mundi and much more. High renaissance / Italian Renaissance era.
Answer:
Try drawing lines from the object to the place of the ground on the opposite of the sun
That's my personally advice
If you want more detailed information you could try watching a few video's or looking at a few examples^^
