How do I char a face to a Decal face?

For the past two days i've been editing a script to be changed alot. When I wanted to change the face to a Decal, I ran into my problem. For some reason when I put in anything to help my script. It always comes up with an error. If anyone knows how I can do this, please let me know.

There is a decal inside of the characters head; paste the decal id as that

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(character)
		local head = character:WaitForChild("Head")
		local face = head:WaitForChild("Face")- - the decal of the face
		face.Texture = "rbxasset://" -- change this to the face
	end)
end)