Which is a key feature of Renaissance paintings?

Humanism, the individual figure.

During the early renaissance period. Many painters were engulfed on achieving and aiming to flawlessly depict the human body into painting and art. This was called Humanism - human art - the depiction of human figure in form of human faces or their bodies expressed in the painting. Some used this style in a form to establish their sense of expression, as a manner to present cohesion and, accomplishing and maximizing "linear perspective" in their art. The Renaissance art devoted itself in perfection and realism to humanism - human face/body - than in insignificant figures or abstracts.