Elon John on the photo of rocketman
There are 18 books in the series.
Answer:
Sfumato was pioneered by Da Vinci. Sfumato is an Italian term meaning "smoky". It is a painting technique that creates the effect of a soft haze, or a sense of atmosphere. Sfumato was used by various Renaissance artists, including Leonardo da Vinci.
Hope this helps!
Man/woman because a baby crawls on all fours then two legs and two legs but includes a cane and the cane does classify as a third leg in the riddle :)