I need help with a image label in startgui to turn off and on based on health?

hi im new here and i've been having problems with this certain code that i made (im new at this sorry if it looks bad) the point of the code is to make it so if your health is at for example 3 on starter gui it would display a custom imagelabel. and would apreciate it if someone could help me out with it? for example when the health is at 3 it would display a custom imagelabel that i made that has a 3 on it (the max health is 3)

local guiObject = script.Parent
local gui = script.Parent
local plr = game.Players.LocalPlayer;
local character = plr.Character or plr.CharacterAdded:Wait();
local humanoid = game.Players.LocalPlayer.Character.Humanoid
local currentHealth = humanoid.Health
local hum = character:WaitForChild("Humanoid");

local function health()
	if hum.Health == 3 then
		guiObject.Visible = true
	else
		guiObject.Visible = false
end
	humanoid.HealthChanged:Connect(function(health)
	end)

sorry if it seems messy im new to this all and after trying to search around for a while i just realized that i got no idea .

humanoid:GetPropertyChangedSignal("Health"):Connect(function()
if humanoid.Health == 3 then
 guiObject.Visible = true
else
 guiObject.Visible = false
end
end)