How can a randomize a players appearance with a function?

Hello, I recently attempted to randomize the players appearance, however it only seems to work if I you the PlayerAdded command. I want to randomize every character's appearance within a table using a function.

In order to make randomization simple I ran multiple tests to see what the population of roblox is, I got values between 16, and 145599999. anything below 16 can give errors because they no longer exist.

So basically this:

game.Players.PlayerAdded:connect(function(Player)
    Player.CharacterAppearance = "http://www.roblox.com/Asset/CharacterFetch.ashx?userId="..math.random(16, 145599999)
end)

the above works fine, but for some reason when I try to incorporate it in a function like this:

function randomizecharacter()
for _, player in pairs(game.Players:GetPlayers()) do
    delay(1, function(player)
        player.CharacterAppearance = "http://www.roblox.com/Asset/CharacterFetch.ashx?userId="..math.random(16, 145599999)
    end)
end
end

It doesn't work at all or give errors.

So how can I randomize players based on a user id value between 16, and 145599999 using a call able function and not only from when the player is added.

Thanks in advance if anyone actually answers this.