What medium is kehinde wiley's portrait bust of cardinal richelieu?

Kehinde Wiley is a painter based from New York known for his naturalistic artistic creations of the African-Americans.  

Explanation:

The picture bust of Cardinal Richelieu was done in the year 2009 depicting a dull cleaned man and the medium utilized was oil on canvas.Kehinde is a given name of Yoruba root signifying "the second-conceived of the twins" or the person who comes after Taiwo. In spite of the fact that Taiwo is the firstborn, it is trusted that Kehinde is the senior twin, sending Taiwo into the world first to decide whether the time has come to be conceived.