How did leonardo da vinci use unity in his art

Unity and variety:
In Annunciation the uniting factor behind the piece is its color scheme. The unity throughout the whole piece is created through the balance. Instead of having competing forces all around the painting, the colors works together from the darker tones in the grass and on Archangel Gabriel to the shadows inside of Mary’s room on the right. The darks in the trees in addition to their pointed shapes serve to move the eye up and out of the center as well as back into it

Unity is making something feel equal and balanced I’m pretty sure. Look at one of his pieces and figure out what made a piece balanced and if there were any certain similarities in multiple proves