unity change the source image or image

public Image test;
public Sprite example;

void Start()
{
 test.sprite = example; //change the source image of the image "test" to the sprite "example" 
}

         Image[] images = PlayerBarExample.GetComponentsInChildren<Image>();         Image face = images[0];         foreach (Image image in images)         {             if (image.gameObject.CompareTag("face"))                 face = image;         }