Why does the image not load? It saids N/A (read description)?

script.Parent.Image = "http://www.roblox.com/Thumbs/Avatar.ashx?x=420&y=420&username="..game.Players.LocalPlayer.Name

ImageLabel = script.Parent.Parent:WaitForChild('ImageLabel')
Plr = game.Players.LocalPlayer
Chr = Plr.Character
Hum = Chr:WaitForChild('Humanoid')
HP = Hum.Health


	
	

so why does this not load I think I did everything correctly

It's because the image itself is 'N/A'. You need to make a decal and use its link instead.