Heh, you've improved alot in the 1 year or so, when I last saw your work. You could try and brush with a somewhat big brush (70 or so) with a high feather rate. Then you just use smudge with a high effect (90% or so), and start smudging from the middle, and drag to every direction out of the 'circle'. Just continue until it actually looks better, not worse :P. Also, the smaller the smudge tool, the prettier (and more time consuming) it will be. I think light purple would be a good color for the brushing/smudging. Also, you could add small white/light purple spots a little everywhere. With a size of maybe 8 or 10. Hope it gave you some ideas.