[namtih]

(28th Feb, 2013 12:39 AM)Tommiiee Wrote:  I have the same problem and have no add-on called 'Artwork Downloader'.

It should be under System => Settings => Add-ons => Activate addons => services => Artwork Downloader

I think without it you wouldn't see any fanart at all. So it should be there and you should be able to configure the resolution.
But I only use XBMC since about 2months, so I could be wrong and there is another method