Custom Loading Screen help?

So,Ive tried this :

--[iLegimate]--

script.Parent:RemoveDefaultLoadingScreen()
 
local screen = Instance.new("ScreenGui")
screen.Parent = game.Players.LocalPlayer:WaitForChild("PlayerGui")
 
local textLabel = Instance.new("TextLabel")
textLabel.Parent = screen
textLabel.Text = " LOADING FABLE OF HEROES ©"
textLabel.Size = UDim2.new(1,0,1,0)
textLabel.FontSize = Enum.FontSize.Size14
 
local count = 0
while game.ContentProvider.RequestQueueSize > 0  do
	textLabel.Text = "LOADING FABLE OF HEROES ©" .. string.rep(".",count)
	count = (count + 1) % 4
	wait(.3) 
end
 
screen.Parent = nil

But what i'd want to do is like,You know when it loads up the game right? It shows a grey background behind the text. What if i'd want to change that frame's colour,Add images etc...? What do i have to do?