Artwork verly low res

When I had minim server simply connected to the desktop hardrive I had high res artwork. Now that I am using twonky on the WD cloud - my app seems to only display a very low res album art.

I am told I can fix this by going to the xml file but I have no idea how to even find this?

SOLVED - by changing the settings to naim from the drop down list in Twonkys settings rather than generic (which it seemed to default too) it seems to have corrected itself