How would I make a the user's image show on a ScreenGui?

I have a Gui with an Image Label inside of it, I want the ImageLabel to change to the User's picture (ie: if you join, I want it to be a picture of your avatar) - how would this be possible? I've currently tried this;

script.Parent.Image = "http://www.roblox.com/Thumbs/Avatar.ashx?x=420&y=420&username="..game.Players.LocalPlayer.Name

You'd set the image to just

"https://www.roblox.com/Thumbs/Avatar.ashx?x=100&y=100&username=" you don't need to do ..game.Players.LocalPlayer.Name.