My Black Jack 2 How Can You Make Your Wallpaper On Black Jack 2 Look Very Clear Not Look Blurry?

How can you make your wallpaper on black jack 2 look very clear not look blurry? - my black jack 2

ok I've uploaded some pictures from the Internet from my Jack Black 2 and I tried to insert my background as an image, but it seems that poor quality and I wonder how I can do better.