PlayerGui not changing image?

I have a script in the workspace. It randomly decides between 1 or 2 and changes a string value to either "1" or "2"

while true do

    local math = math.random(1, 2) 

    if math == 1 then

        game.ReplicatedStorage.Value.Value = "1"

    elseif math == 2 then

        game.ReplicatedStorage.Value.Value = "2"

    end
end

I have this script set to change Playergui's image. Script inside an image button.

while true do

    wait (1)

    if game.ReplicatedStorage.Value.Value == "1" then
        script.Parent.Image = 6946020462

    elseif game.ReplicatedStorage.Value.Value == "2" then
        script.Parent.Image = 6946024491

    end
end

The image just appears blank. Thought? And yes, I named my ScreenGui, StarterGUI