Well, i mean something that just make you say WOW
SG-Style is a master in this. For example, here's one of his sigs:
https://2img.net/r/ihimizer/img177/4782/berbatovyb0.jpg
Here, you got the clipping masks thats a big effect in this piece. Makes the whole thing close to perfect, it blends the whole thing, aswell as making a great effect.
Here's another example, this is used in a different way, as the background behind Cole is a big part of the effect. https://2img.net/r/ihimizer/img177/4782/berbatovyb0.jpg
To cut it completely to pieces, we can find a sig of Liljays (who can master the 'wow-effect' aswell): http://liljay.72photos.com/client_images/11706/shawnjohnsonbitw.jpg
And a sig of AR7: https://2img.net/h/i257.photobucket.com/albums/hh217/cucumber-lad/Michael-Owen-Signature.jpg
You see what i mean by 'wow-effect'?