I haven't uploaded a picture for ages although I've done loads; they just never seem good enough. So although I'm not entirely happy with this one, I've made myself stop fiddling and show it to you! Can't be sure how long it took, but certainly over a week on and off. I saw a gorgeous picture of Lilly Allen and used it as my ref. If you're interested you can see it here http://www.roxwel.com/artists/artistpicture/lily_allen_artist_photo3.jpg.html
All done in Photoshop with Wacom tablet.