Ah, I really enjoyed making this icon. It was great fun. I also amde this for a 20in20 icontest on LJ, for the theme air, so you'll find a lot of little vibrance and later strong vibrance in this icon.
So, shall we begin?
The original screencap:
Of course, you first have to crop your image. I wanted to go with her eyes and neck first, but that didn't work out well, so I only cropped it above her lips.
Like I said, I made this for an 'air' theme, so what I had in mind was not a very bright coloured picture, yet not a b&w one, either. So, of course, I used a vibrance layer.
Vibrance: 0, Saturarion: -49.
To dull it up even more, I used a color balance layer. The only thing I changed was the first slider in midtones. I set it to -9.
I guess here I decided to go for a different technique and pumped up the saturation. I did that by making a new Hue/Sat layer and setting the saturation to +23.