Yes The Mona Lisa is and many more
Leonardo painted in the realist style (he painted what he saw, he did not change it or distort his paintings inn any way) and was part of the Renaissance art movement.
No, the gerund 'paintings' is a common noun, a general word for any paintings of any kind.A proper noun is the name or title of a specific person, place, or thing. A proper noun for the common noun 'paintings' is the name of the paintings; for example:"Mona Lisa" painted by Leonardo da Vinci"Spring Morning in the Han Palace" painted by Qiu Ying"American Gothic" painted by Grant Wood
Very seldom, but here is one example is his drawing called Valley of the Arno from 1473 Click link below to see it!
There are animals to be found in some of his paintings, not as protagonists, though. 'Leda and the Swan' 'Lady with an Ermine' horses in 'Battle of Anghiari' a lamb in 'Virgin and Child with St Anne'. The fish and the dog in Verrocchio's 'Tobias and the Angel' may have been painted by Leonardo.
Leonardo da Vinci did not have any children.
No, Leonardo Da Vinci did not have any brothers or sisters.
no, Leonardo da Vinci had no brothers
no there were no venus fly traps. but there where paintings.
You have not nominated any paintings to choose from.
Leonardo da vinci did not have any adopted children.
no
I can find no trace of Leonardo finding any constellation.