They were important because there were NO cameras back then. Could you imagine not having one single picture of you in your entire house?! :\ Unfortunately, mostly only wealthy people could afford portraits made for themselves.
The Mona Lisa is an example of a "portrait".
Triangular composition was most popular during the Renaissance.
Mannerist painters departed from High Renaissance painting conventions by breaking the principles of design and color that had been put in place during the High Renaissance. Mannerist paintings often feature elongations of the human figure.
The Northern Renaissance in learning was marked by humanists such as Desiderius Erasmus. The art was influenced both by the Italian Renaissance and the printing press. Artists, such as Albrecht Durer, experienced great success from prints of biblical and allegorical subjects. Portraiture also became increasingly popular during the Northern Renaissance.
If you mean the Libyan Sibyl, it is part of his painting on the ceiling of the Sistine Chapel. All his works were made during the Renaissance. Except possibly his last work, the unfinished Pietà.
The Mona Lisa is an example of a "portrait".
Hans Holbein contributed to the Renaissance by painting beautiful portraits. He is best known for his many portraits of King Henry VIII.
The harpsichord was a popular instrument during the Renaissance.
fresco
The lute was a popular instrument during the Renaissance.
Simply that Raphael lived during the Renaissance.
painting and sculpting
Triangular composition was most popular during the Renaissance.
Plain song was not a popular form during the Renaissance period.
Gregorian chants were not a popular form during the Renaissance period.
Oskar
Jazz was the most popular type of music during the Harlem Renaissance.