A few notes, before we start:
» This icon was originally posted
here, for round 3 at
nikita_20in20.
» Program: Photoshop CS5. Vibrance is used, but you can easily substitute that with a subtle hue/saturation layer.
» Difficulty: ? This tutorial is going to consist of a lot of random textures slapped on for no particular discernible reason. My process was basically "let's throw everything on and see what sticks"......... I would just like to disclaim up here that I don't believe this is an effective iconning method for anyone ever ˚⌇˚

Here's the original screencap from Nikita 2x08, from disparue, I think.

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01. I was feeling particularly lazy while cropping this icon, so it was just a quick center crop trying to get as much of only her in it. Usually I don't sharpen (FILTER > ARTISTIC > PAINT DAUBS > 1, 1) at the beginning, but for some reason that's what I opened with here. Then a quick layer mask over part of her hair that got a little bit too sharpened.

02. A vibrance +100 layer to bring out some of the hidden colours.

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03. New auto curves layer for the contrast, then two new points in RGB: 75, 56 and 181, 160 to brighten everything up.

04. Another vibrance +100 layer.

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05. This texture, by
ellaangelus, set to soft light 100%.

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06. This texture, by
mosaically, set to screen 100%.

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07. This texture, by
paytheboy, set to screen 100% for some more grittiness.

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08. Another auto curves layer to add contrast back in.

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09. A blue colour fill layer (#253d7f), set to soft light 100% to bring out her clothing.

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10. This texture by
paytheboy, set to soft light 100% to brighten up her face.

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11. This texture, by
spud66cat, set to colour burn 25%.

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12. Go back down to the base, duplicate it, drag it up to the top, and gaussian blur it at 2.0 pixels before setting it to soft light 100% to soften some of the grittiness that came from setting all those light textures to soft light.

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13. New orange colour fill layer (#ca9e49), set to soft light 50% to make her look less green-y.

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14. This texture, by
mm3butterfly, set to soft light 35% to lighten things up.

15. Quick colour balance to tone down the greeny-yellowness and make a little more reddish: midtones +12, +1, +20.

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16. This texture, also by
mm3butterfly, flipped vertically (EDIT > TRANSFORM > FLIP VERTICALLY) and set to soft light 50%.

17. New vibrance layer, +100.

18. New selective colouring layer:
YELLOWS 0, 0, +18, 0
CYANS -100, 0, -100, -100
BLUES -100, -33, -100, +100

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19. This texture, yet again! by
mm3butterfly, flipped horizontally, then smudged so its effect would be softer after being set to screen 90%.

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20. New grey-to-black gradient map (#d9e6dd), set to soft light 100%.

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21. This texture by
ellaangelus, desaturated, then IMAGE > ADJUSTMENTS > BRIGHTNESS/CONTRAST -25, +100 before being stretched horizontally (CTRL-T) and smudged and messed around with before being set to screen 100%.

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22. Let's reintroduce some contrast with another auto curves layer and two more new RGB points: 59, 72 and 166, 168 to darken things a little more.

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23. This texture by
ellaangelus set to soft light 50%.

24. New selective colouring layer:
YELLOWS 0, -11, +100, 0

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25. New vibrance +100 layer, layer masked over the bottom left since we're not interested in making that part stand out.

26. New selective colouring layer:
CYANS +100, 0, -50, 0

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27. New teal layer (#3a7c74) set to soft light 30%.

28. New colour balance layer, midtones: +15, 0, 0.

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29. Copy merge everything, desaturate it, gaussian blur at 2.0 pixels, then set it to overlay 100%.

30. Finally, sharpen it (FILTER > SHARPEN > UNSHARP MASK). tada १|˚–˚|५