Set public Image in canvas from script

Hi guys, I've got an health system that worked fine in my level 1 : my HUD script is searching for the level manager and see how many lives the player's got : depending on this "int" the hud display a certain sprite of an image, image contained by the canvas attached to MainCamera. I can assign this image by drag n drop but as I want to "dontdestroyonload" my player and his scripts, the HUD really needs to find the image by himself and i Just can't make it work...

Here are some pictures to help you visualize my problem.

Now my script looks like this : [CODE] using UnityEngine; using System.Collections; using UnityEngine.UI; public class HUD : MonoBehaviour {

 public Sprite[] LivesSprites;
 public Sprite[] BeuteSprites;
 public Image LifeBeuteUI;
 public Image LivesUI;
 private LevelManager player;
 public Health health;
 
 void Start() {
     player = FindObjectOfType<LevelManager>();
     health = GetComponent<Health> ();
     Image LivesUI = GameObject.FindWithTag("Lives").GetComponent<Image> ();
 }

 void Update () {

     LivesUI.sprite = LivesSprites[player.lives-1];
     LifeBeuteUI.sprite = BeuteSprites[health.currentHealth-1];
 }

} [CODE/]

I tried to get the image by .find("name") and all the calls I know of, and I just can't get it right. I'm sure I'm a noob on this one but any help would be really appreciate ! :)