What's another way to get a character's image on a GUI?

function GS.getImage(name)
    local proxy = "http://rproxy.pw"
    return "http://www.roblox.com/Thumbs/Avatar.ashx?username="..name
end

That's what I have right now but whenever I use that link, the player's image always turns out pixelated and blurry. I've read the APIs on different valid thumbnail sizes and /Thumbs/RawAsset.ashx does not display an image at all. Is there a way to fix this?

The Imagelabel's size is {0,250} {0,250} (if that's important)

Thanks in advance!