Counter for sprite under script from GameObject prefab

I am trying to create a scoring system by counting the number of sprites within the script component in the prefab. I tagged the prefab as "Tiles".

The part where I added GetComponent(); does not work... I do not want the counter to count the number of prefabs I have, but instead count the number of particular sprites within the prefab. Is the a method? I have 4 sprites under the prefab script component.

Here is my code:

     {
         GameObject[] Tile = GameObject.FindGameObjectsWithTag("Tiles").GetComponent<Image>();
         int numberofTiles = Tile.Length;
         ScoreScriptPLAYER2.scoreValue += numberofTiles;
     }