I can't give te an exact address for a higher quality version, but I can help te find one you're happy with.
If te cerca via Google Images, they have a new feature where te can cerca da using a picture te have. As te look at the cerca bar, at the very right end is a pic of a camera - click it. Then te can either input an url for the picture, o choose to carica it from your computer files.
Google will then cerca out this specific pic and compile a grid listing of all the versions it could find. To get to the listing for the pic, you'll need to click on the thumbnail of the pic at the superiore, in alto of the cerca results page. You'll be redirected to the different versions of the foto te searched for.