GUI Depth not working

I have two different scripts that draw GUI elements.

The first script draws 3 GUI elements, and I use GUI.Depth to place the elements on top of each other: // Draws the background GUI.depth = -1000; Rect backgroundRect = new Rect(0, 0,Screen.width, Screen.height); GUI.DrawTexture(backgroundRect,sceneBackground);

         GUI.depth = 0;
         // Draws the back button
         GUI.backgroundColor = new Color(0,0,0,0);
         if(GUI.Button(new Rect(10, 10, backButton.width / 2f, backButton.height / 2f), backButton))
         {
             Application.LoadLevel("Menu");
         }
 
         
         // Draws the camera GFX
         Rect cameraGFXRect = new Rect(
             (Screen.width / 2) - cameraGFX.width / 4, 
             (Screen.height / 2) + cameraGFX.height / 4, 
             cameraGFX.width / 2f, 
             cameraGFX.height / 2f);
         GUI.DrawTexture(cameraGFXRect,cameraGFX);
 

Then the second script draws a rectangle in the center of the screen, also using GUI.Depth to draw the rectangle above the other GUI elements that already appear on screen:

 GUI.depth = 10;
                 Rect cardRect = new Rect((Screen.width / 2) - (cardTexture.width / 4), (Screen.height / 2) - (cardTexture.height / 4), cardTexture.width / 2 , cardTexture.height / 2);
                 GUI.DrawTexture(cardRect,cardTexture);

Even though the first elements were drawn at a depth of -1000 and 0, and the second script draws at depth of 10, the GUI element from the second script appears below the elements from the first script??

I would very much appreciate it if someone could explain what I am doing incorrectly?

TIA!