First you have to use great wallpapers in order to have a perfect backround. You can play with it for a flow and etc.
Quality?
Oh yes, Gradient Maps, Lightings, Topaz, Sharpening, Dodge, Composition, Sponge, Smudge, Blur.
Check out this : http://maxcheaters.com/forum/index.php?topic=270590.msg2525405#new
Otherwise, I can show you how.